I've had vertigo for 20 years and sweats for roughly 40 due to heavy-metal poisoning and the consequential autoimmune and chronic-fatigue complimications. There've been hundreds of other symptoms over the years.
Point being that I'm still-alive with zero intervention from the medicos. Once it became apparent that I was super-sensitive to every drug prescribed the doctors conceded that my health was best be left to me. I eat super-clean (rabbit food, basically, and yes, it tastes like shit), which is the most-powerful "defence" I have, and it works. Sure, I still have to deal with a roulette wheel of ever-changing symptoms, but none of them scares me anymore and hasn't for at least 30 years.
The body's #1 priority after all is to survive and I have faith in that. Autoimmune, chronic fatigue and so on are just tricky is all, which is why docs futz around with switching drugs, trying this and that and so on. Best to have faith in the body's incredible design and desire to heal / remain alive. Let it prioritise as only it knows best, rather than intervene.
It's up to you what you do obviously, but I'm personally wary every time I hear biopsies suggested (and CT scans and...) 'cause they almost-inevitably mark the starting points of protracted shenanigans. Ka-ching.