Unbearable Anxiety about school run

Good morning everyone, 

I would like to ask if some of you may have similar problem and may offer some advice/ tips about how to manage it. 

I am a mum of 5 years old girl. She is just starting her year 1. I have huge, unbearable anxiety about school drop off and pick up. I have stomachaches, nausea, diarrhea and more. My daughter's school is quite big. It currently has 331 students and school run is something that makes me really ill every day. It's difficult for me because there is so many people there: children, their parents and often their siblings too. I just came out of crisis. Last year in around April time I had to put my daughter to childminder setting in the morning and after school to bring my stress level down. It was expensive and also it's not available now because the childminder can't do it anymore ( her daughter just started different school and she can't offer my daughter drop offs and pick ups anymore). When I was in crisis from about May, I struggled to even drop my daughter off to childminder and pick her up.The childminder was closed for 2 weeks because she gave a birth to her baby son. School have been so brilliant to come and pick my daughter up and drop her off last week of school every day. Also my daughter's teacher and classroom has changed which gives me additional anxiety. Please does any of you have similar experience? How do you cope? 

Any advice will be very much appreciated. 

Thank you in advance.