PPPS, lol, magnesium deficiency has been linked to OCD. It can be difficult to find the right magnesium supplement, though. I'm still trying. Oxide is supposed to be not good (not sure why) but it was the one I could most tolerate. There is magnesium citrate, which made me ill (as I can't tolerate citrus) and there are others. I currently have a chelated form of magnesium from Holland and barrett, but it's too big to swallow, so I have to leave it in water to dissolve (tastes gross) and I have consequently only taken it a couple of times.