I'm been nauseous for 19 days straight now. I went to see my doctor on day 5 as it had been the third time in 2 months that I had diarrhea. He is sending me for a barium enema (later this week). The diarrhea had passed after about 10 days, but I can’t shake the nausea. Should I go to another doctor or just go for the testing he ordered? What could be causing this? I have ruled out pregnancy as I did two tests and they were both negative. Any suggestions would be appreciated