Parenting

I knew before I had my son that parenting would be difficult, but I didn't know to the degree. It is the most challenging and emotional thing that I've ever attempted. Every day I go over each decision and thing that I say to my little boy. I wonder how things I say and do affect him. Earlier this week we had an awful day. We fought and argued most of the day. That night he had trouble going to sleep. I tried and with no success (since apparently something had crawled up my butt that day and I had little patience for anything) and then Rion went upstairs to try. Rowan then proceeded to tell Daddy that "Mommy doesn't like me, she's angry with me". Rion told me what had happened and I cried for a long time. I never, ever want my son to feel this way-ever. And the fact that he's 2 and already had this feeling just tore my heart in two. I wanted to take back that day so badly and just hold him and treasure him like I should have. He deserves so much from me. He was afraid to be around me at that point-he wanted Daddy. What a horrible thing. I will be trying to forgive myself for a while for that one.
He is the most amazing person I've ever met. He has every good quality that I could ever want him to have. And he's only two! People come up to me on a daily basis and tell me how incredible it is that he talks so well. He smiles at complete strangers and tells them "Hello". He says "excuse me" and "I'm sorry" to people who nearly run over him in a hurry at the grocery store.
But still some days it is so hard to do my job. I have bad days and I still have to try to be a good Mom to my little miracle.
I just want what's best for him and so that makes me crazy sometimes, because I can't always give him my best (as evidenced by earlier this week). What do you do when you're having a hard day? How do you go on?