Anxiety

Since June 1st the bugs daycare provider has slightly changed. The woman who was watching them needs to have some surgery so her daughter took over the business. No new children, no new place, just a new face answering the door in the morning. T is even still there for most of the day - although she's trying to take more of a backseat so the kids can get more used to C.
My boys have had terrible separation anxiety every morning since. It is breaking my heart! Every morning the crying, the real tears streaming down their faces, and now Alex is on to the fact that that's where he's going so he refuses to get out of his crib. I thought we were passed the Separation issues. Now it seems we've been thrust right back to the start.
They are fine - by the time I get back to the car I know they've stopped crying because the windows are open and I can hear that they've settled down. When I pick them up in the afternoon they are happily playing. It's just the morning. But it's awful. and it really does a number on my level of Mommy guilt.

How can a single working mother of twins give them both enough love and attention so they feel confident when I leave that I'll return; So they don't cry every single morning? I just want to see them happy.