If you resting HR doesn't get below 100, better below 80, I think it worth talking with your doctor about taking something to lower you HR - a beta blocker is the usual in my experience. There are generic brand beta blockers that are not expensive, compared to brand names.
They where able to get me out of AFib the next day it brought my pulse from 250bpm to 100bpm I am in a sinus rythem now. But I am still getting a high rate and still having chest pains. I am taking a asprin a day to stop clots.
An AFib diagnosis to me strongly suggests some measures to reduce blood clot formation (not a cure, just a risk reduction). Did your doctor say anything about taking an aspirin or an anticoagulant?
If your HR is constantly high, I assume you are in permanent AFib. Is that correct? If yes, this makes the above question especially important.