Seems a bit odd if they have an expensive tilt table with the link to the BP, HR etc monitors that produce data onto a graph against time yet no one can diagnose POTS or not, or postural hypotension (PH) etc… As I said before my Falls consultant was adamant that I did not have POTS as BP was involved. My case is confused by high Bp on sitting, so doubling the salt consumption is no a good idea; I wear compression socks a lot though. I’ve read about Midodrine that it can give relief for shortish periods of standing, but nobody here in Uk has discussed that with me. Got a diagnosis but then no treatment other than DIY stuff. The USA’s POTS charity Stand Up to Pots is better than ours on the peripheral non Pots but related ailments like PH, but can take a bit of finding the web pages.