I have been on anti depressants for 16 years (zoloft, effexor)...in the last few months I went from 150 mg Effexor to 75 mg.....tired and cranky all the time, thought it was the effexor....On July 12 doctor switched me from effexor 75 mg. to 20mg prozac...prozac made me rage...after 11 days of taking prozac, I quit taking everything (July 23rd). Now I am irritable, short tempered and very impatient with people....are these withdrawals or signs of needing to to back on another anti depressant.