Coping with anxiety and daycare

I have a 16 month old daughter that I've been so lucky to stay home with since birth. Recently my best friend who has a 2 year old and 12 month old got a job at a daycare that she takes her kids with her, well her youngest ended up having a broken collarbone the first week there she continued working since nobody said there was a fall etc. she thinks maybe it happened at home, well she said they are hiring so I got a job there! I was so excited tomorrow will be my second week there. But ever since I had my daughter I've had really bad anxiety. Everyday I'm constantly worrying about my daughter is she being treated right is she emotionally ok? Is this too much on her? Will this change her personality? Is someone hurting my daughter? Are they paying enough attention? It gets so bad every morning I uncontrollably sob and can't catch my breath I feel my heart beating out of my chest. I'm always on the edge of my seat and I hate this feeling. I don't need this job my husband preferred me to stay home I just did it because I love kids. Should I stay? Or should I leave? I miss my daughter so much even though I'm there and this sounds ridiculous but I can't help the way I'm feeling about all this. Also a lot of the workers there are really good with the kids but two in particular aren't the best, they tend to scream at the kids for the most ridiculous of things and I've caught one woman smack a little 2 year olds head because it was 90 degrees outside and he was just trying to get water and she swatted at a disabled little 2 year old girl because she wouldn't close her eyes for nap time. These things may seem very small to a lot of people but I don't like anybody disciplining my daughter unless she's being completely outrageous and then that's still only the parents place not a daycare worker. Those two seem very short tempered and that's not a good sign in my opinion to be working at a daycare please help!