Jaime, I just want to say that I'm right there with ya! My dd is very spirited and I can't tell when she's ready for her naps so she gets overstimulated, which makes her sleep for 45 min, which makes her tired faster... it spirals out of control so quickly that she gets tired VERY fast. She was taking 2 hour naps but when she started rolling over, it all went out the door. Your lo will start sleeping better - this doesn't last too long.
Btw, have you tried to extend his naps? I'm reading Tracy's sleep interview in the Sleep section of this website and will be starting sleep training tomorrow. I'm hoping to get her 2-hour naps back.