Hi i am 30 i have smoked since i was 9 yrs old about 20 a day now used to have 40 a day when i worked in the building trade for 6 yrs,i have had a problem with my chest before back around 21 yrs old i developed pleuracy and ever since my lungs feel susceptible to cold weather,but apart from that i have been having this piercing pain in the left side around by my heart it is like a thin needle is piercing my heart which comes and goes from time to time sometimes i have it multiple times a day sometimes short sometimes longer say 30 seconds to 5 minutes it enduces a panic like i may be having a heart attack i tend to think the next one i have my heart could stop,it also appears as of last night unknowst till then to subside if i lay on my back and relax my breathing but if i turn on my left side it reappears and increases if i inhale it increaseswhen happening but occassionaly if i take a huge breath in and out pretty fast and heavy it subsides although now it is getting to a point that no longer works,i have had a chest xray earlier in the year and nothing as a result of it but i feel a dull pain around my sternum alot after and occassionaly i get a tyight feeling in my wrist veins it seems like and sometimes intwermitent pulsing pain in my arm when i have this attack or following it or prior,also my breathing is very short when breathing in and it sounds like crap like i have plueracy again although i certainly do not have it as i'd be in agoy continously if i did,i just can't help but think it's a heart attack or some kind of nicotine induced angina or something to that degree ,i also have had back pain like plueracy at times but goes away uickly usuauly very infrequent thing that not like this frequent chest issue i don't know if it's connected though,i do have omeprazole for my acid indegestion though if that means anything,i do not have acid after/before or during the chest issue occuring..Any ideas might help put my mind at ease about it as it's concerning me to much to just overlook it now,normaly i don't care till it bites me bad with anything but this is getting over the top now.