Firstly, Im really sorry to hear that you are having a hard time ATM. THats not nice any time of year.
However, can you manage on your own? absolutely you can, and you will! Once the immediate stress of the split is over (and im talking the first couple of weeks), Im sure that actually you will find it easier than you thought it was going to be. A lot of stress is caused by the sour relationship, which you dont realise at the time because its ongoing and deteriorating, without you noticing. so once thats out ofthe way, it will become easier on that front.
Next you WILL find a certain amount of freedom (i realise that it wont all be roses because of your DS's needs) that you didnt realise you didnt have before - you only have to think about YOU and your DS. Come and go as you both please, do what you want, when you want - if you want to live on sandwiches and go to the park at 8am, YOU CAN!!!
Im betting that also once the dust has settled, your DS will also be much more settled without the stress of the relationship affecting him too. He may (fingers crossed) be even slightly more easy going (I did say slightly!) and relaxed.
So, as for the statementing: A) you have the backing of the school and all professionals! you couldnt ask for more!!! honestly, hopefully yours might be one of the rare ones around here (NOTTS!) that goes thru without much hitch! you couldnt be in a better position for that whole thing. And B) without the stress of a bad relationship you will have energy to see it thru.
You can do this, and you can manage, and not only that, you CAN and will enjoy life again. Take care, and good luck for this part of your journey XXX