Discomfort in the chest. Asap?

An year ago I was diagnosed with high Blood Pressure and I was taking medicines to control my BP but after a while my blood pressure came back within normal limits. Last night as I was finishing up some left over office work at my home,I started to experience an unexpected discomfort in the left part of my chest and near the shoulder, at one time I could feel my heart beating faster than usual,This episode has been going through my mind again and again, I somehow managed to sleep last night but e ven when I got up I could not say that things were exactly back to normal. I also measured my BP with a digital BP measuring machine that I bought and it showed my BP was only 122/78, I measured again and it still showed 125/80 and then after an hour it again showed 122/80, I don't smoke or drink and I make it a point to run 1.5 to 2 km 6 times a week...should I be alarmed and visit the cardiologist ASAP? P.S I also experienced gas and associated heartburn ( Resting heart rate- 54-59)