Am I Crazy?

What is wrong with me? Today was my official first day of nannying for a 7 month old, a 2 1/2 year old and Declan (3 1/2 months). I am so tired. It was crazy. I still remember all those good reasons as to why I chose to do this. I get to be with Declan, I get paid for watching him rather than paying someone else to watch him. I appreciate him so much more with crazy kids around, and I know that it will be different when the school year starts. Just... for today... I am completely overwhelmed.