A few days ago i was sitting at home and then all of a sudden i felt my chest getting heavy and i found it hard to breathe even after doing simple things like talking, it usually doesn't stay around for too long but sometimes it does?

You may have a psychological problem such as anxiety, or a physical problem such as asthma, or any of a number of other problems. Don't ignore this. See your GP to start the differential diagnostic process.

Your question starts with a description of a single episode but then states"it doesn't usually stay around". Even though it seems unlikely to be due to a cardiac problem, you need to see a physician for further evaluation including a detailed detailed description of the frequency, precipitating factors etc. This will provide an opportunity for reassurance, or further testing if indicated.