After Taking HCTZ (first 12.5 & Then 6.2 Mg) For

After taking HCTZ (first 12.5 & then 6.2 mg) for 58 days heart rate started going up during running. 3 weeks ago after running 15 minutes rate quickly raised to 194. I stopped running and rate started to come down slowly. I stopped taking it at 82 days. I stopped taking it 12 days ago. High rate is still happening. Is this side effect going to go away? How long is it going to take?
I'm 68 years old male, had heart attack in 10/2013 and have two stents. Thank you!