You know what hun, I think what you are describing is pretty normal. Just maybe in varying degrees for different people. You are probably feeling pretty worn out being at the end of your pregnancy, and your mind is probably thinking about a million different things as you your prepare mentally for your new baby!- so maybe that's why it seems bad at the moment.
I am sure when you're little one arrives, it will get better. It's so special having a toddler and a new little baby (although, tiring yes )..all the best for this exciting time!