It's normal for our children to "act out" differently once you open a daycare in your house, as it is a very big change for them. They are used to how it was, and now you have gone and brought other children into the home and all the attention is not him anymore.
I would make sure he gets a lot of "special' attention from you, whether it be before nap (put him down last and read him a book) or after daycare hours. Also, make sure that he has some toys that are just his and are not used by the daycare. It will take him some time to adjust, but once he is used to it, he will relax.