Brian, go see your regular doctor. You could have gastroparesis (your stomach doesn't empty fast enough/well):

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Many commonly prescribed drugs slow stomach emptying. Chief among these are narcotic pain medications, tricyclic antidepressants and calcium channel blockers. Antacids that contain aluminum hydroxide, some high blood pressure medications and the psychiatric drug lithium also can disrupt the normal functioning of the stomach. Symptoms usually improve once you stop taking the medication.

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It can get quite serious so you're vomiting and have messed up blood sugar levels, etc. Just get it checked out.