Autonomic.heart

I was diagnosed with POTS in July of 2020. My doctors didn't specify what type of POTS I have, but I suspect that I may have HyperPOTS. I have severe episodes of feeling like I'm going to pass out because of an intense feeling of "anxiety" but I never actually do. I have recently developed tachycardia when I'm laying down or sitting (well over 100bpm) and I'm not sure why. I can't tell whether I have hypertensive episodes because my BP is all over the place. I can have BP of 90/60 at one point when I stand up, but then have a BP of 180/150 at another time in the same day. I'm not sure what to look for symptom wise either that would indicate HyperPOTS. Any info would help a ton!