Changing from one psychotropic drug to another, particularly after having taken one medication for a long time is rarely an easy job.
Sometimes one can experience symptoms of abstinence from the old drug, sometimes one can experience the side effects from the new drug. Sometimes, one can also experience a rebound effect of the symptoms of the earlier disease.
For these reasons, this kind of interventions would better be supervised by an expert psychiatrist rather than a G.P.
As a matter of fact only a psychiatrist has enough experience about psychotropic drugs to know what is he best thing to do in any given case.
Thus I would suggest you ask your G.P. to refer you to a good psychiatrist to revise your drug therapy.