I'm sorry for what you've been through, Badvoc
. If I was you, I wouldn't hesitate in deregistering DS2. It sounds as if more time with you, and away from an environment he's finding stressful, would do him the world of good. I'm not clear, though, on whether your DS2 mostly enjoys school or not: on one hand, you say he does; on the other, you say he is upset at going to school. You need to have a chat with him, once you're sure that home ed is an option you can cope with, to find out if he would prefer home over school.
I am in a similar situation. Like you, I home educated my eldest DS1, who has SNs. I agonized over that decision. However, when DS2 became very unhappy at school and I realised that the issues were not resolvable, I made the decision to deregister without (much) hesitation. It felt like the right decision and continues to feel that way. The black cloud over DS2 has lifted and he is a happy boy every day
. He is on a waiting list for another school, but it looks as if we have a six-month wait, so plenty of time for home ed stuff first. To be honest, we're having such a lovely time and he is so happy, I'd home ed him for longer if I could. And I feel liberated to be free of all the school nonsense too. I hadn't realised what a burden it was for me too.
Maybe it would be good for both you and DS2 to have some time together after all you've been through? And, as morethan pointed out, it sounds as if he needs time to recuperate from all those illnesses too.
I hope his wrist isn't broken, by the way
.