Thanks. I know what you mean about overdoing it. It was the first proper exercise I had done after Christmas and New Year, so I probably should have started off a bit more steadily and worked up my stamina!
Congratulations, you've managed to live long enought to possibly have health problems. It's best to go have the test. I had one, I have panic attacks and the docs at ER weren't sure if the chest pain was ht attack or panic attack. ugh The test showed I had some blockage, doc advised me to exercise, lose wt..... Needless to say, I now take my anxiety meds daily! And, if there is a problem, probably soon enough that a noninvasive therapy can be used. Relax.