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Dear Melissa,
Given you have symptoms, I think it unsafe NOT to stress you with stress thallium to determine if the heart muscle supplied by the RCA is ischemic (i.e. not receiving enough oxygen during exercise. A stress test is not "extreme stress", rather it is a controlled exercise test whereby the cardiologist can learn the most about blood flow to the heart (even more so if you add an imaging modality like echo or thallium to the test.) I am very sorry that you had this unfortunate occurence; keep in mind that your doctors are doing all that they can to treat you with stents and avoid bypass surgery.
I hope this information is useful. Information provided in the heart forum is for
general purposes only. Only your physician can provided specific diagnoses and therapies.
Feel free to write back with further questions. Good luck!