This is me, only to an extreme. If I get winded, I'm down for the count for several hours. For example, one time I wiped snow off my car, got somewhat winded (to be fair, there was about 6-8 inches on it), and then ended up sleeping for 6 hours in the middle of the day. This happened again with a similar situation. My RE told me to stop doing anything that may cause it and bring it up with my OBGYN. Turns out, I'm anemic. Looking forward to these iron supplements to kick in!