I have heart palpitation for 4yrs;dr. Say it beats like i'm running 24/7. My heart is wearing out.I am currently takin diltiazem120mg a day.this occured from electric shock of 480v.from a prev.job. I was takin metoprolol 25mg but I was still getting chest pains and I felt like my heart was fluttering:shaking. My blood pressure is very low but heartbeats 35% more than average.been thru 5 drs.alrdy.