Living with an Undiagnosed Illness: My Struggle for Answers

I'm 32 female and I've been battling an illness for 3 years now without any diagnosis. There is many days when I'm actually to weak or in pain to move around. I lost 75lbs...pretty much from nothing. I mean I actually don't know what's gonna happen to me in the next couple days, weeks, months or even years. I've began losing hope of ever getting a diagnosis and it has made me severely depressed.