Welcome to HCM,
Thanks for posting query to HCM
Your history suggest angina pectoris
as cause of chest pain
,This was good that your 2 D Echocardiography
was normal but your coronary angiogram did not reveal any block.
( I presume spasm not in vein)was there as you have given information which can also cause chest pain.
This may be Variant angina(Prinzmetal's angina) that occurs due to coronary spasm.
That is the cause even if your Blood Pressure is normal still medicines are given which are coronary vasodilators that are used for coronary spasm.
Please take care of diet and exercise and healthy life style like avoiding smoking and alcohol, keep your Lipid profile
in desirable range,and take your prescription regularly.
Dr.Akhilesh Dubey M.D