2 weeks ago, I was sitting upright in bed watching TV and I had sharp shooting pains accross the left side of my chest and under my arm. I then felt dizzy, sick, clammy hot my eyes had all dots and i coudnt see nor hear properly! It passed after about 5 mins. I have experienced the pain with out the other syptoms and vice versa, but i leterally thought i had a heart attack! I am 20 and i have had a chest xray and an ECG prior to this. I went to the doctors and they have given me a Haltor monitor for 24 hours. Can you help?