My cardiologist believes that I have coronary artery spasms also. I am on a low dose norvasc. I can't really say that it controls them if that is what I have. They simple come and go as they please. However I do not have attacks as bad as you.. When I have them, they are more sharp than dull and crushing. They do not last long but come back for a few hours. Mine are definately triggered by very stressful events such as my daughter being ill and hospital. Then they will just take off and I will have them daily for months.
The 'warm rush' you describe does not sound coronary artery spasm related to me but what do I know. I am not a doctor. I have had that sensation before though. I always attribute it to adrenaline rushes. They pass quickly for me and since I tell myself that it is an adrenaline rush I never let it bother me or escalate into a full-blown panic attack. However I do not really know if it is that. ??
However I am female and it took a couple of years for me to get a diagnosis. In that time, I ran into doctors who did not know what was wrong with me, would get frustrated and simple tell me I was either depressed take this antidepressant med or having panic attacks take this anti-anxiety med. I felt that they were wrong but I sought out a counselor who taught bio-feedback to work with him if I was having those types of probelms. That way I could deal with the issues without being on the meds which I was opposed to. I learned alot about the parasympathetic nervous system by working with him and that is where I got the idea that those sensations were adrenaline dumps into the body.
I hope that you get hold of your doctor soon and he can provide better insight. If you find out what they are, I'd love to know since it sounds similar to what I sometimes experience.