My heart is racing, actually hurting the beat is flucating between rapid beats and slower beats, my head is very dizzy, I have felt dizzy for about three weeks now, and as if I am constantly hungover (I m not). I feel a little sick / nausea too. I was on 15mg Lexapro for 10 months four weeks ago this was reduced to 10mg I am being weened off, don t know if that is relevant. Whats wrong with me? Should I be wooried?