36 weeks pregnant and no energy seems to be the new normal. And also lots of pain.

I'm a homemaker with no born children and all I can do is about an hour of whatever on my feet (today was packing the hospital bag) and then like an hour of computer work per day.  And I keep needing to take naps!

And everything hurts so bad! My pubic bone, my hips, etc. I cried yesterday, it was so bad.  

Is this normal or am I somehow exceptionally unfit? I still have 4 weeks to go; any chance this is just a phase and I'll get more energy somehow? I feel so useless and like a failure.  I keep hearing about all these women who are still running 5ks, etc at this point, and I can't even get it off bed.