Consider therapy guided cognitive behaviour therapy; coupled with mindfulness. Find a good, experienced therapist. Make clear your expectations, and be confidant enough to walk away if it's not working. You've had an illness for a long time and have deeply learned behaviours. You need to unlearn some of those behaviours. You might not be able to fix everything in the 8 - 14 weeks that CBT takes, but you should get techniques that help you cope and that you can keep applying over time.

Consider talking to a doctor about medication. I have no medical training, I'm not going to advise on medication. But there are different types of medication. There are different types of anti-depressant, and there are anti-anxiety meds.

While you're doing that you might need to put in some work on building up resilience. This will include support networks of people to socialise with; education and work stuff; exercise; etc. It'll include getting your food sorted out, and your sleep hygiene.

Expect to put in a lot of work.

But good luck!