I am trying to go through the same thing right now (Effexor). After going off the medication is is normal to go through a small time of depression; someone on an SSRI (like Prozac) has more seretonin receptors occupied than someone never on one. Even going off Prozac slowly, your brain needs to get used to it. Try going for walks, take up a hobby, or doing something you enjoy. Give it a little time, you'll feel better!