C.T.
Hi A. - I just happened upon your question and wanted to reassure you that your son's crying will pass. He is right at the age (15-18mos) where the avg. kid goes through the worst kind of separation anxiety. Thankfully it will pass. A "lovee" will help but the childcare workers are really the key. I disagree with Mayda, definitely talk to the manager and let him know in a nice way that you wish he could find someone who was as good as the other lady.
You might have a chat with the childcare workers who are there that he is just at this developmental stage and could they be patient with him and comfort him, and that with some distraction, he could have some fun. My son who is almost 2.5 was a crier this time last year and had a really hard time when I left him at church. It started getting better by his 2nd birthday when he changed rooms and was with other 2 yr olds. They commented just the other day that he never has a problem - he walks right in and has a lot of fun.
In the meantime, maybe you could borrow a jogging stroller or find a "mommy and me" class to help you get through the next couple of months. Best of all things to you!