Hi, it sounds to me like PVC's,but i am NOT a doctor,you need to see one pronto! you can go to the hospital to their clinics,most have programs where if you have no ins. they will take you under "charity care" for just about anything,not just an ER visit,but any clinic,please go!
Last year i was shoveling so much snow,an hour later i was on my knees with bad heart palps. & later on for two days i had PVC's.It may not be life threatening,but you need to find a dr. Good Luck

Krissy