I can’t say any more than what the research says as I’m not in the medical field, but it has helped it.

“It’s possible. Doctors may prescribe Mestinon off-label* for conditions such as:
postural orthostatic tachycardia syndrome (POTS), a sudden increase in heart rate when you stand up that often causes dizziness
orthostatic hypotension, a drop in blood pressure when you stand or sit up that may cause dizziness”

Thankfully my insurance did cover the tilt-table test for me. Taking the test, the dr finding an issue and getting treatment has helped quite a bit. But it was only only a part of my issues.

I have heard that there are tilt table tests that can be done in dr offices. Maybe research that and see if that is an option for you. It was a rheumatologist who sent me to a cardiologist requesting tilt table test. My first cardiologist didn’t want to do a tilt table test since I wasn’t actually fainting. Another dr referred me to a cardiologist who has been dealing with long covid patients. He was willing to do the test. Good luck to you.