My child's preschool is driving me crazy

This is probably more a vent than anything else but here goes. My FS (4) has been in preschool (state sponsered) for 3 week and has gotten sent home 4 times aready and I think they are thinking about calling me back to come and get him today. He made it through the first week fine. The second week, he hit his teacher. OK, I used to be a preschool teacher too, and I would have sent him home. Second time, he threw a temper tantrum and was disruptive. Third time, he ripped his sock and the forth time, he was scratching his eye really hard and they thought he would do harm. Now today, I get a call that he is scratching his arms and making them all white, (he's biracial). So the nurse just called me and asked if I thought anything might be upsetting him---duh, he gets in trouble at school everyday for goofy things, that may be upsetting!!! He's been in time out at least 2 times a day everyday. Usually it's for making a face at someone or for not sleeping at nap time. It was all I could do to get him there this morning, I woke with a very high fever (102.6) and the school is 20 minutes away, I do not want to go get him already (he's been there 2 hours). He's off all next week so I'm going to wait until the following week and ask to see the director. It just seems that he is behaving like a 4 year old and they don't know what to do. I'm afaid I'm going to have to become their worst nightmare--a highly educated (masters in special Ed.) Mommy who cares and has time to cause a stink.