The last thing you need is to have your poor damaged head buzzing with nightmare scenarios, hiding, so let's see if we can bring some light to bear on what's been happening behiind the scenes, so speak, and give you some calm reassurance and accurate information that will enable you to avoid any unneccessary knee-jerk reactions to your horrendous ordeal.
Firstly, I note that he rang his dm (your mil) yesterday morning, expressed himself as sorry for what he'd done to you, and may have asked her to pass this on to you.
If this is the case, it may be that he's had the wake-up call he needs but at least we know that he was awake and, presumably, compos mentis yesterday morning.
In the normal course of events the police cannot detain anyone longer than 24 hours without charge and it therefore seems that we can safely assume that he has been charged within this period.
After a charge or charges have been brought, the police have the power and the discretion to release him on bail or to remand him in custody pending an appearance at a Magistrates Court to enter a plea, at which time he can make an application for bail which may or may not be opposed.
If this/these is/are his first offence/s, please don't be under any illusion that 'keys will be thrown away' because in all probablility he will be granted bail, either by the police or the Magistrates.
It may be that the police have charged him with one offence, most probably drink driving, and are holding him pending a further charge or charges relating to his attack on you.
He will have had opportunity to consult a solicitor; if he does not have his own solicitor on call, a duty solicitor will have been made available to provide legal advice if he so requires/required.
It may be that the police will release him on bail later today and it is probable that conditions will be imposed. These may take the form of him being required to live at a stipulated address and not make any contact with, or approach to, you and/or other parties.
Alternatively, the police may keep him in custody until he can appear before the Magistrates which will most probably be on Monday morning. If the Magistrates grant him bail it is probable that similar conditions to the above will be imposed.
In any event the police should liaise with you and keep you informed when/if he is bailed. However, there is no bar to you calling the police to ask for an update whenever you choose/feel the need.
As dc were in the house when he attacked you, the police are obliged to send a report to SS and you may receive a visit from a social worker during the coming week.
If the police haven't done so already, they should/will refer you to a dv counsellor who will most probably be associated with your local Women's Aid service.
In addition, you may be given the contact details for a designated police dv or family liaison officer who will keep you updated and be available to answer any questions you may have.
Take advantage of all of the help that will be made available to you to safeguard yourself, your dc, and your home, and take up any offer of counselling services for yourself and your dc and, in particular, for your amazing dd - please tell her that she has the wholehearted respect and admiration of many who regard her as nothing less than a heroine.
As you've been identified as being at high risk of dv, if an offer is not forthcoming ask for a panic button to be installed in your home and for any additional items - extra entry door/window locks, pir lamps, sealed letterbox etc - that will enable you to feel safe in your own home again.
Bear in mind that, as you're not likely to unwittingly invite him into your home again, if he wishes to gain access he will need to break in which will give you time to call 999/press the panic button and it's probable the police will be on the scene before he's managed to pick/break one lock.
If this is his first encounter with the law, and/or the first time he's spent any length of time in police cells, this is likely to be a salutory experience for him and no-one that he encounters during the process will leave him in any doubt about the seriousness of the situation he finds himself in.
With regard to 'the police' having decided to prosecute, the fact that the CPS intend to proceed against him means that you are not in a position to withdraw either your statement or any charge you have made against him.
If your mil should attempt to inveigle you into 'going easy' on her son, you can in all honesty inform her that it is not in your power to do so and he will have to face the consequences of his actions by answering to the law.
Please don't let hysteria overwhelm you. The shock and the injuries you have sustained will make you feel very shaky for the next few days and it will take you quite a while to get back to a place where you feel that life is 'normal' again.
Be kind to yourself. Wrap yourself in a metaphorical soft woolly blanket or, better still, a real one and treat yourself as if you are convalescent - which, of course, you are; eat little and often and rest - lying down on a bed or sofa - whenever you feel the need.
As your bruises heal you will begin to feel that you can put your head above the parapet again without it being blown off - you'll get there, honey, one step and one day at a time.
After the above which is, hopefully, grounded in logic and reason, this may sound odd but you need to know that your dps are with you and they will not let any harm come to you.
You can talk to them as you've always done and hear their voices; let them be your sixth sense and know that they will always alert you to any danger that may threaten your wellbeing and that of your dc.
With luck your twunt of an ex-h is on the way to learning his lesson and you will have nothing further to fear from him but if he should have the temerity to overstep the mark again, rest assured that he will get his and you will be unscathed.