This is a good sign that he is healthfully attached to you. Going to daycare, he promptly looked for someone else to be healthfully attached to.

His need for a one to one close bond and healthy and the need must be met. Keep him at home with you. Day care is not the best thing for him.

I learned this in a workshop with Doctor Aldort. I learned to read my children's behavior cues so I know how to respond. What I read in your child is a need to be with mom. Take him back home. In a while he will be himself again. When he is ready for peers and time away from you, he will play with many kids.