Could you tell me what could be causing my heart palpitations(some times it feels like it is in the middle of my chest as well)? I have been having them for a couple of months now. I have not had caffeine in over 2 weeks and have even eliminated caffeine, sugar, wheat, dairy and gluten in the past two weeks but nothing makes a difference. It is a very irritating feeling because it is nonstop everyday. I am physically active and in pretty good shape although I am trying to lose some unwanted weight. Any comments would be greatly appreciated! I am a 46 year old female.