I'm taking it as well for brain parasites. But mine just went into my head recently that I know of..
If you feel sick just go to ER and tell the truth. What's the worst that can happen except a huge bill...They'll probably do another MRI which you can compare with the old one..maybe show your doctor that the meds you are taking are working; if that's the case.
Always have a list of all meds you are taking handy in case of emergency.