Suggest Treatment For Lightheadedness And High BP After Metpure

I was taking Metpure XL 25 mg BD for past one year for irregular heart beat with BP measuring as 110-115/70-80 mm Hg.Suddenly for the last 10 days my BP shot up to 146/94 mm Hg.subsequently the dose was increased to 50 mg BD but stilll the BP is in the same range with a feeeling of light-headedness,fatigue and a feeling of run-down.Shoul/d I continue the same prescription or some otther drugs are to be added?