I have been really sick the last two days. I have stomach aches, a headache, and my stomach feels gurgly. When I sleep I sleep on my left side, but sleeping like that irritates my stomach, making it impossible to sleep. If I sit upright, my stomach doesn't hurt as bad. But the thing is I cannot sleep sitting upright. I also feel like I am about to throw up, but it never happens. What am I sick with, and what should I do to get better?