If you're concerned, go to the doctor. I agree with the tip about the sugar though. Chugging a bottle of Robo is like chugging a bottle of Chocolate syrup. Probably not a good thing to do too frequently

I have extensive experience with DXM and while I don't do it anymore I also never experienced anything like that. Though, everyone is different. Try drinking more water over the next few days and see if you feel any better.