I have no energy-boosting tips. My approach has been to accept it. My baby needs me to be still and use my energy for growing. This won't last forever. Each new part of my baby's development (esp. in the first two months) lasts just a few days; if it needs extra energy today, so be it.
I'm normally such a busy, driven sort of person that I would never have believed it would be so easy for me to relax like this! I do have times when I get frustrated. But it helps to have a partner who's always saying, "Remember that you ARE getting something done--something very important!"
and to look up what organs are developing right now. When I know that I'm making, say, vertebrae, I can lie back and imagine each little vertebra winking into existence and forming its proper shape and relationship to the others, and it doesn't seem so strange that I don't have much energy or attention for other things while I'm busy getting that right!
You can buy bread and let the floors get sticky for a little while. Your body is telling you to slow down for a good reason. It will pass in a few weeks or months.
...but if anybody else has energy-boosting tips, I'm listening!
I do need to be able to get myself off the couch and out of the house on time for an appointment once in a while!