I feel the same way as you do. I don't know the answer. Maybe antidepressant drugs would help for a while. Maybe just allowing time to pass.
I just want to say that sometimes A/D's are the answer. I thought I was doing fine after BD and handling things well. Then inexplicably, about 2 months after BD I suddenly fell into deep depression and started having extreme anxiety attacks. There was no particular trigger, it literally just started one day. I always thought depression was just having a down day or week or whatever, did not realize until then that depression is a very real illness that often requires medication to fix. My doc prescribed A/D's, it took about 2 weeks for them to kick in but once they did I started feeling like my old self again. I was on them a few months and then weaned off with the help of my doc. That was over 4 years ago and I've never had an issue with depression since. The A/D's may very well have saved my life, I was really in a dark place for a while.