I think LDN is incredibly overhyped. I'm not denying that it helps some people. At the very least I would advise anyone not to visit any FB groups, because most of them are cult like. If LDN didn't help, you're doing it wrong. Almost like the BPS crowd. I had a very negative experience with LDN, at first it made me feel better, but then a few days later I had the worst orthostatic intolerance EVER. I couldn't stand for more than a mimute due to extreme head pressure. Fortunately, it went away after a few weeks.