Heather.

Dont give up, it is normal to get depressed when your ill and in pain.
Remember every person on this site has been depressed at one time or another. You keep going to the Doc until you get the answer your seeking. I went over 10 years without a Dx.
Remember people with As have what my Doctor calls and invisible disibilty at least until the damage is done and noticeable, and sure lots of healthy people think its in our heads, but have you ever noticed that when a healthy person strains their back they cry and moan like its the end of the world.
I felt like you back in 85 and i also had black thoughts, but remember you have people who love you, and they would miss you so much.
Come here and come here often as everyperson here will listen to you and try to help , after all we are all suffering. Never feel embarresed to vent because we all do it when we feel theres no hope.
So keep your chin up Heather and good luck with your Doctor Visit.

Rick