My doc has recently changed my painkillers from Tramadol to Meptazinol & this morning I nearly passed out.I came over very hot & I was dripping wet luckily I wasn't alone in the house & managed to sit on the bed.Then I started to feel sick & got into the bathroom & threw up !!! Feeling very tired & drained frightened to take any more incase this happens again.Has anyone else had these side effects ???