I started on Celexa 20mg on Tues.4/14. My first side effect was diarrhea, but considering my gastro problems in the past, I think that's understandable. After 2-3 days I started feeling like something was biting me, my legs, arms,back, head. Caused me to think I had Noseeums on me. I didn't take last nights dose, took benadryl for what I thought was an allergic reaction. Then, upon reading up on the internet this morning I realized something I was taking contained St. John's Wort. Do you think that the combination of the two meds could have caused this reaction??