I've been in a double depressed episode for about 4.5 months and have been on celexa for about 3.5 months(10mg for 2 months & 20mg for the rest) After it reached full strength it worked wonderfully, it did more than I expected, I was back to my usual Dysthymic state, but recently(the past few weeks) it seems the celexa has stopped working and I feel even worse then before I started it. My question is if this can happen taking celexa?