1 1/2 weeks into my life change

It's been a week and 4 days and I'm getting great results.  I've lost 9.5 lbs so far!  I need more energy, though.  In the middle of the day (probably in an hour or so) it feels like all the energy gets sucked out of me.  Yesterday I had to put my 14 month old in her crib for 1/2 hour just to lay in bed and close my eyes.  So it's been really hard to exercise, because of the lack of energy.  Plus I just started classes again and all the free time I get I'd like to do my work and everything.  I'll have to do some research on some good energy-boosting food!