That's very interesting. Yes, I tend to get a little nervous before I start to exercise ("What if I have a panic attack during the exercise program and everyone laughs at me or we have to call 911?", "What if I really do have a heart condition?", etc.) and my heart rate goes up pretty quickly when we start. During the middle of the workout, I usually do well but it's always afterwards. It seems to take 30-60 minutes for my heart rate to get back to the resting level (apparently this is normal when you haven't been exercising a lot recently like me; it takes less time as you get more in-shape with continuation of the exercise routine/regimen) and sometimes I have other symptoms that accompany (derealization, legs feel strange, stomach feels weird, etc.). Glad to hear that from your therapist, shaggy.
Just for the record: I've had 4 EKGs, a stress EKG, blood tests, and 2 chest x-rays. All have shown that I'm VERY healthy (everything in my blood work is in the "optimal" or best range, although I eat really healthy for the most part, being a hypochondriac). I also just got a full scale heart evaluation today on my own choosing (echocardiogram, arterial scans, EKG, lipid panel) and have to wait 10 days for those results, JUST to be sure.