I have pseudotumor cerebri. i've read pomegranate, milk thistle, turmeric, capsaicin all hold carbonic anhydrase inhibitors naturally. is this true?

Use with care: I can confirm that pomegranate and turmeric contain some carbonic anhydrase inhibitor activity. However, these do not have enough of this to be clinically useful. It is much more straightforward to take a small dose of diamox (acetazolamide) instead. Although it does not work for everyone with PTC, it helps many. The side effects would be the same if the medicine dose was the same.