What's happens if you stop taking your medicine cold turkey?

My psychiatrist told my last year in January to stop meds. It was nightmare going through reductions. Since September I’m on 0.5 flupentixol is Ok but I think I have lots of psychosomatic problems like my period is not regular, I’m cold sweating but my hormones are OK etc. Sometimes I have bad days and taking 1mg, quality of sleeping is much worse I can sleep later I have nights when I can’t sleep. I know something is wrong.
I had one psychosis. On meds since January 2011. Very fast recovered and they change my diagnosis from paranoid schizophrenia to schizophrenia NOS.