... my anxiety and panic attacks came back with a vengeance. Went to the doctor. He said that the Celexa pooped out (stopped working) so he tried upping to 40 mg. Still not helping. So my new doctor suggested that I switch from Celexa to Trintellix. I'm terrified of switching for fear of withdrawal or panic attacks. Does anyone have any advice? Similar stories? Best way to wean from one to another?