I’ve had similar problems, although I think mine started due to another undiagnosed medical issue
I tried the NHS and they were spectacularly disappointing in offering any real help.
I’m not saying it’s always the same, just in my case they were no use at all. Beta blockers and on my way, the tablets made me worse if anything.
I’ve had up and downs with it all over the years. I eventually had the other medical problem diagnosed (Lyme), but again through a private clinic. I was on treatment with them for around 18 months, and started improving, but I simply can’t afford £600-700 every few months.
With regards to the anxiety, what helped me was a guy that dealt with various relaxation, hypnotherapy, CBT type therapies. It took a long time, and I think I’m getting worse again, but I got lazy with the techniques. I am starting some of them again, and hope they will get me out of the cycle.
Best of luck with it all