I Am Taking Levoxyl Due To Recent Thyroid Removal. At

I am taking levoxyl due to recent thyroid removal. At various times during the day, I notice irregular heartbeat, mostly a slower rate followed by irregular rates. I also have a sensation of throbbing in my center chest and a need to purge my lungs and take a deep breath. I am also taking Benicar/HCT, YYYY@YYYY and amlodipine.