I'm sorry you are feeling so sad right now. Just remember that things will get better.
My family has had a really tough time lately. This past fall, between Sept. & October, DD16 was admitted to the hospital on FOUR separate occasions. On her 5th visit, she was admitted and stayed there for 8 weeks.

She just came home three days ago.
During all those weeks, no matter how bad things got (and believe me...they were BAD) and when DH and I felt like complaining, we would say to ourselves and each other, "Hey, why are we complaining? There are people here who have it even worse than we do". That usually would stop us right in our tracks from complaining and feeling sorry for ourselves.
I guess what I'm trying to say is....be thankful for the good things you have and remember that things will get better.