Kenalog and diet

I got a shot of kenalog for seasonal allergies. I told the doctor if there was a possibility of gaining weight from it that I didn't want it. He said it shouldn't make me gain weight, and acted like it wasn't a concern. So I took the shot, and one month later I had gained 20 Pounds! I hadn't changed my diet, and was only drinking slim-fast, and hardly even eating any food. What a bastard of a Doctor! I could not get the pounds off through exercise either. Clearly the shot had made me retain fluids. I got the shot more than 15 years ago, and I still have a weight problem today. I was drop-dead gorgeous before this nightmare!