I get the same thing walking up stairs, I think mine is due to muscle tension... my body is working much harder than it should to get up them. A little out of breath too... yet I can go play softball with my kids and be fine.. just can't pull myself up stairs without racing/pounding heart. Kinda weird.
I'm not procrastinating----I'm still doing yesterday!!!!
I have no medical training, any medical opinions expressed in my posts are just that....opinions.