Wether it is the illness or not, it is still your feelings. You are still you. So if your family is blaming your reactions on your illness, then they don't want to accept your feelings as valid. Also, they don't to take responsibility for their own volatile behavior towards you.

So, your family needs to recognize this and stop blaming you for reacting to their annoying remarks.
Or, if they don't change, maybe you could just ignore them, realizing they are just ignorant.

We all deal with this to some extent.