I know the weariness of long term depression is hell. I agree that you have been very strong to have endured it and continue to fight.
I just know through my psychiatrist that there are so many medical options out there and they are discovering new ones constantly. Keep in touch with your dr.s and make sure they keep looking at new things for you.
If necessary do some research on you own and make suggestions to them. My doc has a huge book he refers to plus he reads lots of articles in his magazines. Find a dr. with a true love for his calling. It will help a lot.
I hope you feel better soon.