See a doctor
The more important question is how fast your heart rate
If it is under 100 BPM it's probably ok. If it remains above 100 then it needs to be looked into. If it stays above 120 you should go to er. Medications are typically used to slow the hr down. You could try to bear down like you're straining. Hold this for several seconds (val salva). This sometimes works. More important see a doc.