Not able to stop oxtel?

i am taking oxetol after jurk in my left legs 300 mg twice , just after taking one tablet my leg was ok , but the doctor suggested me to take it continuosly for 3 months afterwards every time i visited to the doctor he suggested me to take it continuosly, now i am taking 150mg in morning and 300 mg at night , i have tried to stop the medicine but whenever i did that i fell sick and gone to bed , it was like nothing is in body, i was able to reduce the dose to 150 + 300 mg only , now i want to do it to 150 + 150 mg but able to do so , i fell drowsy and not feel well . how to stop this medicine . pls suggest ?