Just one suggestion - my daughter (then in her 30'3s) went through a year like what you are describing a few years ago. Her Dad & I finally took her to the ER during a particularly bed bout, and insisted that they "figure it out" - in came a Nurse Practitioner who listened to her story and ended up checking into her gall bladder function - no stones, but very low ejection fraction. Out it came, surgeon described it as "ugly" and she was on the path to healing. Having been sick for so long, it took about a year, but she is healthy and strong now despite many months of Covid then post-Covid syndrome.

Sometimes you just have to find the right provider, not always a physician, who listens from a fresh perspective. I would suggest finding a new primary care provider and asking for a consult.

Good luck - feeling bad for a long time is miserable, and it does affect your mental health.
Sue