question: I woke up today afte three hours of sleeping (worked overnight shift) with severe upper abd pain that went to my back.  I tried to reposiion myself thinking it was just back pain or sciatica flareup.  I then became very nauseated and vomited and abdominal pain was intense.  I have not had diarrhea but was belching a lot.  The nausea has subsided but abdominal discomfort continues.  When I tried to go back to sleep, back pain was theuu biggest issue.  I am mostly concerned about the severe abdominal/back pain that woke me up.  Now that I am up I still have abdominal and upper back pain.  I have to go to work in a couple of hours.  I  am just wondering what my symptoms might mean and kin