31 yo male diangosis cardiomyopathy. tonight had sudden sob, hot flashes and rapid heart beat. only lasted minutes. never had these as sx. is this typical?

NO: Your shortness of breath suggests either that you're feeling very anxious about your diagnosis or that you are retaining fluid in your lungs - either issue should be addressed. The rapid heart beat may be the cause (with warmth) so a monitor to record your heart rhythm is indicated. This can be 24 or 48 hours (Holter), 30 days (an event monitor) or up to 3 years with an implanted loop recorder.