My "variety" of angina was almost identical to heart burn, having suffered both. But I was/am now able to differentiate the two because the angina can "burn" on an empty stomach and it can only be brought on by the most severe exertion...and it tends to radiate to the shoulders more than heartburn from acid reflux...and then it goes away within 2 minutes of stopping the exertion. But for me, the angina really "burned"...not unlike the burn in one's thighs after protracted heavy leg extensions.
I went for 10 years telling myself "it's only heartburn"...not my heart
I knew I was kidding myself.
The proton pump blockers were originally devised to cure ulcers over a period of several weeks. But Big Pharma being Big Pharma they realized taking it every day is MUCH better for the bottom line.
If my heartburn acts up (rarely), I prefer using simple antacids...they work quickly for me. I think daily Nexium year in and year out is a bad idea except for very special cases.