What do you advise for heart rate increasing what's wrong?

How suddenly: Weather this is an Arrhythmia, or not, depends on how suddenly the heart rate increases. An arrhythmia, is an abnormal heart rhythm, caused by a "short circuit" in your heart. It typically results in sudden increases in heart rate, to very fast. Gradual increases, over several seconds to a minute are usually due to stress or exercise. See heart rhythm specialist (electrophysiologist) for test.