You need to get your bodyfat down because you are putting extra strain on your heart with all of that weight gain.
I am running a Test E cycle now. I am seven weeks in. I have only had one bad injection. I believe I hit a nerve. But the injections always go in smooth. It never hurts, but it might be slightly sore the next day. I only feel it when I think about it, and then try to feel it. My gear is not bunk.
I do not believe that injection pain is a good way to guage wether or not your gear is bunk. Instead, you should just base it off of your gains in weight and strength. That will tell you if your gear is legit- provided that your diet and training are good