I have quite an in-depth knowledge of these kind of investigations. The OIC will write your statement with you, let them worry about wording it.
There's a few things in concerned and unsure about. The Section 18 was due to him kicking me down some stairs resulting in me breaking some ribs (I think) but the police also have about 17 different images of other injuries I have recieved off him at different times. My OIC said to include this in my statement, but I've read otherwise that this will not be taken into account?
Include it, it shows the relationship history which is very important. It's upto the CPS if it's taken into account (in my experience it will be) even it's used as bad character to support the S18 rather than individual charges, it shows an abusive relationship and supports your account of this incident. If you didn't include it then told me about it I'd come and take an additional statement from you, it's important.
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Also it might sound honestly really odd but I can't remember much of what happened on that one morning when he did it. I think PTSD or something like that has caused my mind to go blank on details so I'm worried about how to write my statement if I can't remember alot of it or how it will stand up if it goes to crown court.*
You can only say what you remember, don't make anything up, say it's affected your memory and that you think you're trying to block it out subconsciously as it was so horrific. If it goes to Crown Court the CPS believe there is enough evidence to convict. They wouldn't put you through a potential trial unless they're pretty damn sure. How it "stands up" is their problem not yours. You can only tell the truth. You have supporting evidence which you outline below, it's not just about the actual assault.
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I did go to hospital and there is proof of my broken ribs, however I told the hospital that I had fell down the stairs as obviously I was scared* 😞
Happens all the time in domestic assaults, say you were scared and that's why you told the hospital this, which is the truth. Include it in your statement.
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I also have quite a few messages from me to my best friend a few mins after it happened telling her what had gone on etc should I send these to my OIC or the police as evidence?*
Absolutely yes! First disclosure is fantastic evidence especially from the time it's happened,
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There's also a message from his brother the day he got arrested saying that my ex has a temper etc and I should of known better and walked out and if I don't drop charges my ex will comitt - will this be used as evidence?*
Maybe, but it's important you tell the police about this message. It could be seen as witness intimidation which is also extremely serious.
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Finally if this does go to crown court I am absolutely petrified of the whole ideal and especially getting cross examined 😞 and its going to sound really stupid but he has as he has got a very very long list of previous he will more than likely do time and I feel guilty for that and also worried he will comit suicide.*
It's not like on the tv, it's very calm. Yes you will get cross examined but all you do is tell the truth and then you can't go wrong. You ask for special measures and they'll screen you from him so you can't see him and he can't see you. There is only one person to blame if he does time - him. You didn't cause this. You might be worried about him but what he does or doesn't do is not your fault. He's abused you and is still trying to control you by getting his brother to contact you and say such things. The court will take a very dim view of this.
Ask the police to put you in touch with an IDVA (Independent Domestic Violence Advisor) they will support you with the investigation both now, through court and afterwards. They are fantastic people with a wealth of knowledge who can help you validate your feelings and help you through this. You can have as much or as little engagement with them as you like, but if you think you've got PTSD they absolutely will help you access help for it, and will help you even if you choose not to make a statement.
You are braver and stronger than you think, even just to get to the point where you are with an investigation is a huge step. Please access help from IDVA's if nothing else. Good luck x