Dear Michael,
You mention that problems have been occurring over the past two weeks. Did these behaviors actually appear in such an acute fashion? In other words, were the behaviors not in evidence prior to two weeks ago? This is a crucial matter, because sudden, abrupt, acute onset of such symptoms, striking people as almost literally 'out of the blue', implies either physiological causative factors or major stress/disruption in his environment.
Now, keep in mind that the transfer to a new setting would, in and of itself, be unsettling. It sounds like the transfer is exacerbating an already-problematic state.
At home, your son seems to be a normal two-year-old, from your brief descrition. If he is medically OK, and there is no unusual stress in his life, he may not be developmentally ready for the out-of-home experience (though it sounds like something more acute is occurring. Change is structure, staffing, schedule, etc. at a pre-school setting can itself promote instability. The obvious note is that something(s) is/are having a destabilizing influence on your son. The task is to figure out what it/they are.