I feel nauseated so much and it's starting to drive me batty. I rarely actually vomit, but it seems like I spend half my time trying NOT to. And I'm not really sure what's causing it. NO, I'm NOT pregnant. This has been going on for several months, so if that were the case, I'd know it by now. I have problems with heartburn and my doctor has me on Prilosec OTC indefinitely. Is nausea a side effect? Anyone have any ideas?