What Causes Chest Pain And Fluttering Of Heart Post Having A Stent For Heart Attack?

Hi I had a heart attack on Sat just gone rushed into hospital had a stent fitted on Mon and sent home on tues, but since coming home I have got mild chest pains having to use gtn spray also I am getting a fluttering sensation in my chest, I went to my GP s to day he wanted to re admit me my blood pressure was 188/96 can u pls give me some advice