Yes their has been a couple of times I have had that happen. It's also happened when I've overdose my meds on accident. You get really hot and clamy and really nausea like your going to throw up. I usually would just throw up what my last dose I had taken and felt better but then have an off day the next day since didn't get both doses into me that night

Also how long have u been on the that med dose for mine took a long time to adjust to