My experience of disease illness is SOMETIMEs disease illness can be easer to live with then TRYING to be happy find your happiness again.
Illness disease guilt is very good at trying to rob you of your Family & Happiness joy Laughs you once had.
YOU can do FORGET how to be happy ... so you do need to STEP back take a minute and remember and not waste opportunity any opportunities to be happy and tell those close to you how much you love them and mean.