Woke up this morning with what felt like extreme hunger pains to the point I didn't want to eat but had a couple bites of cereal, pain went away after I lay down for a bit. came back maybe 2 hours later and ate lunch and the pain would not go away, after finishing lunch I feel like I'm going to throw up and have horrible pains in my stomach, but havent thrown up, the only thing that gives me any relief is laying down. what's going on?