Will Lorazepam Help With My Irregular Heartbeat After Stopping Hypertension Treatment?

I was diagnosed with young hypertension and was put on hydrochlorothiazide 12,5mg, aspirin 150mg and after three months of treatment, Amlodipine 10mg. I developed easy bruising around my legs and upper abdominal pains. After 6 months I was told to stop treatment and review will be in a month. A week after stopping I developed an irregular heartbeat, it would happen for a few days and stop for another few days then start again. I went to see my doctor and he prescribed lorazepam to help calm my heart. Is it going to help? Coz my resting heart rate is around 58-68 most of the time.