I agree, I hope that you get answers sooner than later. I am so glad to hear that you psychiatrist is becoming actively involved in ensuring that you have the answers that you need in order to alleviate some of your depression. And your doctor appears to be willing to continue to test you in order to give you a definite answer.
You have been through so much and I know that it can seem so overwhelming at times. I am glad that things are starting to move in the right direction
Peace and Blessings
Look For The Good and Praise It!