Recently been diagnosed and was given 40mg of propranolol, lately when I’m walking the right side of my chest and only the right side is tight and feels kinda heavy, to add to the worries today I was walking and felt a heart palpitation which then made me feel nauseous and I checked my Apple Watch and my bpm hit 160 and I was only casually strolling.
I have had 2 ECG’s in the past 3-4 months and everything came back perfectly normal.

Does anyone else experience this or is it an underlying health issue?