go see your doctor immediately. it could be something in your stomach.
Does this occur only at night? Are there any triggers you can think of? I have something similar but it occurs only at night. I have a migraine variant and after stress, or eating MSG, sulfites or red wine, I vomit all night long and cannot stop and get stomach pain but no headache. They did very test in the book on me and after 8 years of seeing every specialist I thought I must be crazy. I went to a psyciatrist and he talked to me for a for weeks and said I have a migraine variant. I had an EEG done and it was positive for a migraine or seizure pattern. I am now on meds for it and haven't had it since. If it occurs only at night it is a possibilty. Also, it could be a food allergy. For me I had to take medicine that would knock me out and it would go away. You Could try taking Benedryl and see if it helps for a while. It is fairly well tolerated and makes you tired. It has an anesthetic property to it. Before I got diagnosed a doctor had me take it for a year. It did work for a while then started coming back after I got used to it. I also tried an antidepressant given by a neurologist to get me to sleep. But if yours happens in the daytime you may have another problem like food allergy or need a different medicine. Let me know what you think.