I am sorry. I can identify with you after having lifelong anxiety / depression. There are some conditions that we inherit that can cause it. Do you know your cholesterol readings, especially your LDL? Very low LDL can cause anxiety / depression (per Mayo Clinic).

I learned this a couple years ago and have been taking Omega 3 fish oil daily and have been doing better. LDL is always referred to as "bad", but we do need a certain level to keep us in balance. The psychatrists in Australia recognize the problems of low LDL, but not in the states.
It is a condition that needs to get into balance, so keep a focus for a solution. Try some light exercise when you can, especially outdoors if possible. Short walks in nature can help. Also, try challenging puzzles, reading a good book or doing a hobby as a mental break. Most of all, remember you are a good person and it will get better.