I had to decipher SWIM - is it "some one who isn't me" ??
And I thought E was Vitamin E

, but after looking it up it must be (Ecstasy- MDMA)? correct?
I don't know how much help we will be for that kind of drug/reaction/aftermath scenario.
But if the symptoms started soon after the use , I would think they were related somehow.
I suppose you already did searches about E itself -
http://www.google.com/#hl=en&source=...6c79a56c95bda8