a neurologist would be the one to diagnose pots, generally, but the tilt table test is the gold standard in pots testing... if they said they couldn't make a formal dx, is it because the results were inconclusive? what sort of doctor said that they couldn't make the dx, was it your pcp or someone else? and yes, pots and other symptoms/comorbidities of me/cfs are common after covid, so i wouldn't be surprised if that's the culprit

I got a POTS diagnosis on sight without a tilt table test just because the doctor felt like I was such a textbook case that they didn’t need more tests.