I know this has been done to death, but everyone seems to mention side effects coming on after 12 hours or the next day? Just curious if anyone has experienced effects after sooner than that? It's only been a couple of hours and I feel terrible. Head feels all tense, achy and foggy. Could be anxiety I guess (dislike needles!), but I didn't feel like this after the first 2! Also barely had side effects for the first 2.