Breast reduction, worried because of previous heart attack?

hi,i have been approved funding for a breast reduction on the nhs,and waiting for an appointment for a discussion with the plastic surgeon,i reall want this done,i am 58 yrs old and a size 36f,the volume of my breasts feel very heavy,my main concern which scares me is that nearly 6 yrs ago I had a heart attack and had a stent fitted,have had a couple of angina attacks since,but otherwise feel fine,i am worried about this