I am a 21 year old woman. I recently developed occasional fast heartbeats accompanied with a tightness in my chest. It started 3 days ago after breakfast. I have a history of cardiovascular diseases in the paternal side of my family. These irregular beats and shortness of breath arrive temporarily for a maximum of a couple of minutes or even lesser. After that, everything goes back to normal but it relapses within a certain interval. I have observed no specific time gap between these irregularities and i'm worried I may be developing an underlying heart condition. Please help.