Rich, knock the testosterone out of your system and a new you emerges. Unfortunately, it is a more lethargic, more contented you with quite an appetite. Unless you guard against it, you'll find the pounds piling on. You'll have to be very self disciplined about getting regular exercise and resisting the temptation to eat just a bit more....
Decide on your target weight and calories out per day in terms of exercise, weigh yourself daily, get a pedometer maybe and hit that target! I went through this ten years ago and have to stick at it because I'm still on Zoladex, with the added complication of steroids which magnify that undesired effect. So I do sympathise and offer my way of dealing with the appetite and weight problem. You may find as I did, that you adjust eventually and don't need the gadgets aftercare while.
AC