Im addicted to pain killers and i have heart problems

Hi I have been addicted to pain killers for 5 years and i now have heart trouble, the trouble normally shows itself as a really rapid beat,apparentlyit still forms a perfect wave but it jumps from a resting heart rate of 68 to 180 in a split second,it lasts for a few seconds usually 10 to 15
i have had tests and examinations for this but,i have never admitted to being addicted to pain killers, i found it recently possible to stop smoking so im feeling a little better,but im worried that the pain killers are going to kill me before i beat that habit, is it possible that the pain killers are doing me harm
the pills i take are Solpadol
i started using these for a problem with my neck and never really got off them.
Please give me some advice

probably has more to do with smoking than opiates. Speaking as a current opiate addict and recent ex-smoker. I had exactly the same and found out that it was the tobacco.