If you had no antibodies you'd be dead. We can test for specific ones, but "very high antibodies" could describe any number of different test results, some of which would clear up on their own in time.

If doctors tried giving you anti-anxiety meds, strict lifestyle and diet changes could well help with some anxiety-causing disorders.

In short, I'm a little skeptical that you've got the correlation/causation correct.

I have Hashimoto's which is an autoimmune disease. My TPO antibodies were very high. Took 3 years to get them in check. Another doctor tried giving me anxiety drugs because he had no idea what was wrong with me and that was his answer. Thankfully I found a great doctor that specializes in autoimmune diseases who put me on the right path.