dinach, my point wasn't that there were no answers, it's that there are far too many answers. The fact that there's such a litany of possiblities, we'd just be spinning our wheels on this one. If it were a more common symptom like, "My face is itching, I also use Morphine, what's going on?" we could answer it with a little more confidence. With more obscure instances like this one, our usefulness in terms of empirical evidence isn't as great.