Why is Prilosec giving me side effects?

Hi,I did the following:

Why is Prilosec giving me side effects?Two days ago, I started using over-the-counter Prilosec instead of Nexium in order to save money. My GI doc said I could do this when I'm in a financial pinch. Trouble is, now side effects are manifesting themselves in the form of headache, stomach pain (not indigestion/GERD), and constant belching (again, no heartburn associated). I've read that all three can be side effects. Does it sound like I need to bite the bullet, aka shell out the extra cash, and resume Nexium? (Nexium has never given me any side effects and I've taken it since 2005).

-My Evil Twin
Pay or suffer, it's the same old story.

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