Been on celexa about 4,5 years... started at40mg..then was at 60mg... worked so well after a couple yrs. Went down to 40mg..worked good ..went down to 20mg..bad idea! Now went back to 40.. then went back to 60... don't feel as good anymore. ..been on 60 for about 3 weeks... did it just stop working... does celexa poop out?