I got my b12/lipo shot today, and it did not hurt, and i dont feel funny at all. The doctor said to expect to lose up to 35lbs in the first month, and 5 to 8lbs everyweek thereafter. Of course you need to eat right (alot of protein),drink at least 62oz of water a day, and cardio. Because when you do stop taking the injections, and you still want to eat junk food, and not exercise, you will gain weight back, of course. good luck