HELP ME MY LEG BURNS AND SO DOES MY HEART

Patient: I am 70 now and have Asthma and Gas. Recently I have had his re occurring problem of my left leg burning and then the heat spreads to my whole body causing my heart to start beating rapidly for about 10 mins after that the pain subsides a bit and then the pain travels back to the same leg. Now after taking painkillers the pain has decreased but it worries me.

Symptoms: Leg burning, rapid heart beat, hot flushes, weakness

Doctor: