Oh I forgot this- to try to keep from getting so winded I try to walk a little slower than usual and rise from sitting or sleeping slowly to give the blood a chance to pump through. Before going up stairs I try to walk around a little beforehand, like down the hall, to "warm up".
I would ask your doctor just to be sure. I've had some achiness in my chest on and off that I think has been muscles. Stairs always make me winded but more so since I've been pregnant. I've also had my heart skip a few beats once in a while which feels scary but they said was normal here and there. But they also told me to let them know if it happens more often. Just to be on the safe side, it wouldn't hurt to get your doctor's opinion...they may want to run some tests just to rule out any problems or it may sound okay to them.