I am 17 years old. Lately, i have been expierncing different kinds of pains in my chest. I am 260 pounds, six feet. Sometimes it is sudden and sharp on the left side, other times it is a little achey, and other times it is slightly burning. I notice that when i lay on my left siade, i get palpitations, and after i get up from that position, my heart is pounding and i am a little dizzy. Once in awhile, my left arm hurts aliitle from that position, and at random times. I have recently had a physical, and the doctor said my heartbeas sounded fine and my blood pressure was normal. It had a previous history of being slightly high, but no concern. i should mention that i suffer from acid reflux, so i get heartburn, burping, upper back pain, etc. Also, my fingertips get cold sometimes. I should mention that my grandmother on my fathers side has had a triple bypass and 2 angioplasties. She is 76 years old, and doing well. ANyone have any ideas?? Im only 17!!!