My Ecg normal, echo normal(ef65%), but tmt was positive, coronary angiogram report is  normal arteries with slow dye clearance just one year ago.calcium score was 0 in 2023 ct cag test report too, hs crp value 0.48,, HDL 64, ldl 54, tg 42, cpk mb 19( ref was <25), creatinine 0.72, bp remains low most of the time between 109-112 /65-75, pulse rate normally 64 bpm. I feel discomfort and tightness  like feeling just a Aligned to the left chest nipple to the flank of the left chest while walking, feel palpitation type of sensations while i start walking or stand up from sitting position. Non diabetic, non smoker, non alcoholic. I walk 30 minutes every day. Is it a heart related problem? Do i need to go for another angiogram? Please help doctor, i am very anxious.