My DS is the same age and can be a handfull at times. I think if the unsettling has passed then it may be something you just have to wait it out and do what he needs for now. keep talking to the girls at Daycare. I too wouldnt have a problem with him co sleeping with you for now. I dont typically do it but he does go through stages where he will wake in the night. IF you really dont want him in your bed then maybe you can make a bed in his room till he settles down again. Put him to bed as usuall and then put him back into his bed at night, if he gets up again maybe you could sleep in his room.
It sounds like you are doing all the right things and Im sure it will pass. Good luck.