I Have A Prostate Cancer Discover Early In Feb. 2014

I have a prostate cancer discover early in Feb. 2014 with metastasis, I'm under zoladex 10.80 mg and estracyt, what has reduced my PSA from 2.538 to 0.24 today, but the side effect is mamel getting big, passing from 75 kgs to 87kgs despite the fact that I'm jogging 3 times a day fro 30 minutes early in the morning with some gym exercises - how long will that last and the medication will continue for life or stop as I'm 57 years old