Its good to hear from you again although I feel bad about the way youre feeling.
Youre right that life seems unfair. Having 4 disorders definitely doesnt make anything better or easier.
Sometimes our expectations clash with reality. We have a vision of what we wish our lives to be like and when it doesnt turn out that way, we feel upset and disappointed.
However, once one accepts their situation, hes able to take action that will lead him to where he wants to be.
Have a great shabbos and try to stay strong!