My daughter takes it and for her it has been one of the most helpful drugs for dealing with the POTS. Years ago she was diagnosed with an anxiety and mood disorder, but it wasnt until insomnia from the pots became a huge issue that clonzapam was prescribed.. Didn’t help the insomnia but I noticed right away she was so much more able to deal with the pots symptoms so we switched it to a morning med. Anxiety/panic has a negative impact on pots symptoms as well as pots symptoms has a neg impact of the anxiety/panic and it’s really help that. Oddly the insomnia improved once we switched it to mornings. Seems less panic/anxiety during the day helped for sleeping.
Hope it’s as helpful for you as it has been for my daughter.