Hi! I am a 26 yr old female, in shape. I jog, mountain bike and am completing P90x at this time.
Recently, while mountain biking and doing the cardio aspect of P90x, my heart feels like it is beating too hard. I can feel it under my sternum and it makes me nauseaus. I have to take off what ever I am wearing because any pressure on that area makes it feel worse.
About 6 years ago I had an EKG while in the ER during an unrelated visit and my heart skipped a beat every so often.
Any ideas what this could be? Thanks so much for your help.