Nausea is ruining my life?!

Okay, here's the deal. It started with a stupid gag reflex this morning and now it's turned into cold chills, nausea, and shakiness. What's going on? I doubt very seriously that I'm sick because I'm not running fever and I generally don't feel bad. I have bad allergies so, my nose is stuffed up but that's never caused me to feel sick. What could be going on? I didn't sleep well last night. I couldn't fall asleep until about 2 and still woke up at about 5 and couldn't go back to sleep. Could it be I'm tired? I'm staying home from school today because I don't really want to feel bad at school. I'm gonna leave in about 20-30 minutes to get some dramamine to see if that will help with my symptoms, if I can manage to take it without gagging it right back up. My gag reflex is really really bad. It tends to ruin my life at times. I have the sensation to gag and usually sucking on something or drinking water that's ice cold helps with that. And usually if I can get my gag reflex under control, the nausea sorts itself out. But this has been the worst case of gag reflex with nausea that I've ever had. Any ideas?