Me Benadryl (diphenhydramine) & Nexium for my anxiety and panic disorder, i, what are the side effects?

It sounds like the. Anxiety has negatively effected your GI tract, which explains the use of nexium. Nexium can cause headache, nausea and diarrhea commonly and low magnesium levels and may effect how other medicines work. Benadryl (diphenhydramine) is an antihistamine which can cause headache, diarrhea, dizziness, drowsiness and other side effects.