Dear Stclaire,
Hang in there.Father,son,child to be, and mother.
Much of what your son is expressing is influenced by the mode/mood of the household; Much tension; yet , by no means do I say this in a 'negative' sense.
Regroup; Find common ground between the 3 of you ; allow dis-ease to be just that and nothing more. Family 1st;verbalize /express what 'love'/emotions you can summon .It is only a thought away.

Dis-ease may twist and pry;but WE always have a choice on how to interpret what we are experiencing.I am not trying to appeal to your logic ; but rather empathatically send you my concern through type-written words.Our remedies have boundaries as we do; but the remedies are here to help not do our task at hand. Find safe ground emotionally and mentally; and allow what is safe to reach out ;stablize;survive. No disease can stop a safe retreat.From this safe viewpoint initiate your tactics ; and allow your will to dictate. You 'will' find much of what is happening can be buffered by diverting habitual reactions . Find why you are a family; and what attempts to make you 'feel' otherwise.

Sorry for the non-remedial narration. I care, I guess that is all I am saying.

It is too easy to say it will all work-out; But I will say, "What you 'will' will be." May appear silly; but somehow it seems fitting (?).