Thanks for your responses everyone.
coff33pot- the doctor at the assessment was brilliant and didn't imply that it was my fault. I was just so taken aback by how ds1 could not multi task at all, his eyes aren't working together - it was a long list and it surprised me as I only asked for his referal on a hunch because we have a lot of behavioural problems with him. Then ds2 had his assessment and has almost the exact same problems - so I am feeling really overwhelmed by how much work we have to do here.
Its because we have problems with both of them that I feel so down about it. At school ds1 rarely (if ever) speaks, and does not complete any work in maths, is doing OK in literacy. He tells me a lot that he is confused and doesn't understand what is going on. At home he is jekyll and hyde - wanting to do anything to please, playing happily with his brother, and then extremely violent the next.
Doctor said at the assessment they have almost identical sensory profiles,but that the problems are manifesting themselves differently in each child. That's why she said it may be something genetic, because their problems are so similar. I can buy into this to a certain extent. My cousin was a violent child, who went on to under achieve at school and eventually flatly refused to attend school once he was big enough to physically fight my Auntie. He has never explained why he hated school so much. He also had problems with getting his eyes to work together (ds1 and ds2 both have this), an extent of hypermobility, and low muscle tone (also ds2). He is a lovely young man now, but very limited work prospects because of lack of education.
Previous generation was two girls (my Mum and Auntie) and no obvious problems, generation before that, my Grandad's brother was 'retarded' (terminology of the day, and as much investigation as was ever done on the matter).
Sorry I am getting more and more rambly. I have got myself in such a state that I am simulatneously thinking:
a) Its both of them,I have messed it all up and should just walk away and leave them with their dad
b) Its genetic, I'm doing OK and should stop worrying about what everyone else is doing, and crack on with doing the exercises, getting help at school, sorting out some uderlying health problems.
But I am literally thinking both completing opposing view points at the same time. I really just want to get over this and get on with it because I know in reality I would never leave them - just don't seem to be able to.