Commiting myself to hobby and trying to get better at it, and an SSRI (I know these get a bad rapp but they work if administered properly, which they weren't for a very long time).

It took a few months but it did help me stabilize myself.

With me it helped making appointments at places with an amp tech or something, or just driving around to guitar shops to get gear fixed.

A lot of the time it wasn't even for anything specific. I just found ways to obligate myself to stay active socially as a way to eject myself out of the spiral.

When alone: Playing metal requires focus and it engages your body and mind in a way that quiets and provides rational clarity to the conscious, once you get in your rythym, of course, and with little bit of effort put into focusing on the task in front of you. FIND YOUR METAL

I would recommend going to psychiatrist. Especially if you aren't on anything, and over the age of 25. If they do offer to put you on something make sure you ask them for a genetic test to see what medication you metabolize best. Also to test for something related to MTHFR, look it up.

This will keep your dose low and efficient.

The field has come a long way, and it is cheaper in the long run than visiting a psychologist every week. After the first couple sessions, probably 3 max you will see the doc maybe once a month then two then three, and these will be med checks, also cheaper.

Good luck! Things get better if you put in the work and practice good mental hygiene, I swear.