Work and IBS

4 months ago I started working as a preschool teacher. 2 months ago I was diagnosed with IBS. This is making my days at work very hard, because if I need to use the bathroom I have to call the front desk so they can send someone to stay with my kids. I spoke to my supervisor about my situation and she told me not to worry. The situation is that now every time I call for help they take a long time to answer, which is giving me anxiety. I love my job, but I don't think I can work feeling like this anymore. I've been thinking what other jobs I can do that aloud me to use the restroom any time I need. Any suggestions will help me.