Stress Test Question

Has anyone had to do a stress test without the dye while they had Lyme Disease. I'm a little nervous I have to take one next week to check my heart valves I have Mitral Valve Prolaspe , Had it way before Lyme. Now next week my doctor wants to do a Stress test and an echo in between the test to check the heart and valve. Has anyone else had to do this?
I hope I have the strength to handle it.

Thanks. : )