I often feel like I am on an all day adrenaline rush and when I "come down" I am completely exhausted. I also have palpitations along with that feeling. I am obese, but I have been trying very hard to get that in check.I have been on a strict fitness regimen for the past 6 months or so and I am also keeping down my calorie intake, along with eating more protein, fruits, and vegetables. In the past 6 months, I have only lost 3 pounds. Could this be a problem with my thyroid?