I'm sure there will be others more qualified to help than I am - but can I just recommend a book I found really helpful.

It's by Russ Harris and it's called 'the happiness trap'. It's based on Acceptance and Commitment Therapy and it's really easy to read, and like I said really useful.

Other than that - I'd recommend seeing a health professional if you haven't already. And if you have, but they haven't helped, I recommend trying someone else.

Take care