last week, around sunday, i started having really gross liquidy diarrhea. i got over that in 2 days (like a person normally does), but then i started just feeling nauseous non-stop. even lying down doesn't help, i just always feel like i need to vomit. when i try to vomit, i just retch and gag and spit; no puke comes out. recently it's been a little better, but i'm still having it.

what is wrong with me and what can i do to feel better and sleep/eat/work like a normal person again?