About the most comforting thing I can offer is: it's completely normal. I remember getting stuck trying to squeeze past things/people sideways, and having food fall on my belly, and thee last month where I wore the same pair of slip on shoes no matter what (when I wasn't wearing slippers, or nothing). It is not terribly fun, but it is standard with the pregnancy package, and IT DOES NOT LAST!

You'll also find that your energy comes more in fits and starts (I did a crazy-long walkabout a few days before I went into labour), but you're right that the endurance isn't what it was, & it takes a while postpartum to build back. Even still, it's not forever.

You will be fine. Hang in there, respect your limits and otherwise proceed as normal.