I've been doing bootcamp for about 14 weeks and added in kickboxing 2.5 weeks ago.

Perhaps you could see/talk with a nutritionalist too because it may not be an exercise issue. Could be how your body breaks down (or doesn't) certain things that causes the weight issue.

I second the dietitian/nutritionist suggestion. Talking to one was one of the best things I've ever done! She clued me in to the glycemic index which tells you which foods help keep your blood sugar stable.