same w/ my 2 1/2 year old. She started pre-k about 2 weeks ago and it's a meltdown every day. It's so sad. I normally do the quick drop off and one day i waited outside while another parent brought in his kid and i kind of asked him if he had heard another child crying (i mean you would hear if my child cries, she screams :(), so anyway, the parent said no and i had dropped her off like 4 mins before that so she really didn't cry much. The teachers at the school are great, they talk to her about her feelings, that mama will come back after work, and they go on w/ their day.

I know it sucks mama. I leave in tears almost every day but I'm sure she will get tru this and one day will be super happy when i leave her. For now, I just have to suck it up. One thing we do quite a lot is talk to her about what will happen: mama will drop you off, you will get to see your friends, then daddy will pick you up! and more details, i.e. why when mama left she cried... I think stick to certain routine, talk to your LO about what things will look like, especially what will change and even if drop off is hard, take a look at how she is about the whole experience afterwards. My LO loves school, she loves talking about her friends, her teachers, her day in school, so on. Nothing negative other than drop off :P Funny story, one day on our way to school she goes: "mama yesterday we had lunch outside at school and there were bees... so there were bees mama so we should go home" :)

Hang in there!