Mine don't stop... they go crazy crying until their heads begin spinning in circles. My son, age 3.5, cried for 1.5 hours today on his 3rd day of preschool (but, he's been through a lot of hospitalization and has a serious attachment to me and Dad). I just tell anyone who I leave my children with, don't hesitate to call me. I don't want them crying like that. I'm an at home mom and they are there for "fun". If it's not fun to them, it's not worth it.
My 15 month old, has never been able to be left with anyone besides Dad without hysterics that DO NOT STOP. And she hasn't been through any medical trauma, but she has been through some brutality from her brother who has catapolted through developmental phases aggressively as he has recovered from cancer treatment. I am her almight protector. So, she also has an unusual attachment to me.
I just submit to them. I understand... and I accept. This is a season and it won't last forever for either one of them because we are healthy, growing, and thriving. I socialize them by participating in play groups such as Salem Cooperative Indoor Park and Sunday school. I quit the gym. Because I have a long term plan to be there with them for a lot of their socialization, but hang back a little more and more and let them work things out and play on their own with the other kids more and more.
I take care of myself by bicycling. It was a great purchase and fun for all of us. We have the two seat trailer for times when I'm going alone and the upright back of the bike seat attachments (so the little one is right up next to me, right behind me). My husband carts our boy in the upright bike seat in his bike too. It's a great family activity and the baby's really like watching each other ride behind us on the bikes, when they are not sitting together in the trailer.
I don't have great advice on "forcing" them to be in childcare no matter the crying (I am a BIG sucker for the cry). I can only say that this is a season of usual or unusual attachment that you can be mature enough to submit to, accept, and tolerate. Put together a long term practice plan for socialization so that you have a "freedom" you are working toward. And find a way to take care of yourself or take breaks along with baby. It can be done.
God bless, YM