Tannin Sensitivity, GERD, and Meds


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I typically drink only cold-brew coffee and tea because I have a problem with tannins but also have an addiction I have refused to let go of.

I upped my intake of green tea recently by 3 cups and lowered my intake of coffee by 1 cup (which lowered my overall caffeine intake) and didn't seem to have any problem. As soon as I restarted Lithium, however, I have begun to notice that tea is giving me nausea just like it would if I brewed it regularly.

I'm not sure why that would happen, except that maybe it's my GERD that's being affected by both, and having two things irritate it at once is not working out.

Does anyone have any experience with anything like this?