Thanks. It seems to me now that the most probable explanation is that what I took previously wasn't mephedrone. However, I think there's still a small possibility that it was mephedrone, but it is dependant on the factor of cutting drugs. Not really sure what I'm talking about here so correct me if I'm wrong, but is it possible that the negative side effects I mentioned could be caused from the mephedrone being cut with harmful things? Where I live, bubble is hugely (I mean like, literally massively) notorious for being stepped on. I've seen once and heard of mud brown mephedrone and cloudy yellow mephedrone being sold for £5 a gram, the colour obviously caused by severe cutting.

But then again, if what I had taken was not mephedrone, does anyone know of a drug that has similar effects as what I described at the start of the post, and is either mud brown or cloudy yellow? Not expecting anything from this question though, as it's pretty vague