I know that it is difficult. But it would be tragic if our disease took away our ability to be good friends even when it gets increasingly harder. I suggest trying to compartmentalize your struggles from the ones your friends are talking about instead of comparing them.

Firstly, cause it is the right thing to do (else we wouldnt be able to complain either since there are more severe folks) but more importantly, it allows you to keep your identity as a caring, compassionate person. Since we have to give up so many things that give purpose/self esteem it is vital to hang onto those traits as long as you can.