My dear one had his first stent placed in July of 2015. Had to have a second one Oct 2016. He has been a very active person all his life. Now, he is having daily episodes of feeling a fluttering in his chest and this is accompanied by a feeling of fatigue. He also complains of feeling like he s walking through mud when this hits. It usually hits when he is out doing his mornign chores on the ranch. He wakes up fine, though. It may linger through out the day or come and go. Is this side effects of medication? His heart specialist doesn t seem too concerned.