Why does i'm experience palpitaion? sometimes it leads to difficulty of breathing. can you please help me?

Difficult: Heart palpitations can be a minimal issue more noticed by those under high stress; the ensuing anxiety then cascades into shortness of breath. There are also conditions where the heart beats irregularly for a long period of time, do to a faulty electrical system in the heart. You need a 24 hour holter monitor. Your physician may recommend a cardiac echo. Go in to see your doc.

Yes: Could be anything from anxiety to an abnormal heart rhythm. I would go see your primary care doctor for additional evaluation, such as an ekg, to better evaluate the problem.