You haven't told us anything about the "treatment". Were/are you on a beta blocker? With high BP I would think that's a possibility and high BP should be treated, all the time. If you were taking a beta blocker (e.g., Metoprolol) for high BP and it helped calm you irregular heart rhythm, that seems very reasonable.
So, while your situation is not clear to me, it does seem that you need to be on, or go back on, a medication to control your BP, and discuss how to best control your irregular heart rhythm.