I opened in January and have been going going going with 1 day off (for a funeral at that) and am beginning to feel "burnt out" as well. I think the most important thing is to not try and be superwoman! I know I get really stressed when my house is a mess or I feel guilty when I don't do alot of programming with these wee ones... now I know that its okay! Its okay to have days when we don't "feel like" opening our doors. Thats one of many things that is fantastic about our job! We are able to have lazy days where we do LOTS of free play and other days when we are feeling motivated to have lots of days with programming.
Don't beat yourself up!