I know this is a weird one, so I hesitate to state it a bit, but maybe it will help someone. I discovered this like 20 years ago or so, and am not sure how people will take it. I discovered the semi-precious gemstone amethyst helps alleviate the pain of angina when held in the left hand or over the heart. Apparently it also causes osteoporosis and dental problems too, if near the body too long, as it gradually dissolves fats and minerals too.
Weird, but since it's cheap and easy, I thought I'd speak up.