What's with the Attitude?

I am really having a hard time with my 7 yo son. His attitude is so difficult right now. He complains about doing everything and this is really making my life hard right now. It is affecting my daughter too because we do many subjects together. He stops our reading with complaining and when asked to do a notebooking page he will say his hand hurts too bad to finish. This week has been the worst. He had me in tears on Tuesday, I just couldn't take it anymore.

I want to be a good mom to him. I just don't know how much more of this I can take. The only thing I know to do is to pray for the situation...I mean really pray. I am also going to start punishing him by giving him extra chores to do when he just refuses to mind during school for absolutely no reason. I have asked my husband to help me out. We decided that during school time he is the principal. If Evan can't send him to the principal (dad), and then dad will decide what is wrong, and what, if any, the punishment should be. This way I don't have to completely stop school work with my daughter to deal with my son.

We are going to try this out and see how it works. I desperately need something to give with him. He really is such a sweet boy with a good heart. I definitely believe that he wants to behave, he is just going through something right now.