Hang in there moms (posters and lurkers)!
If school officials didn't believe me at first about my daughters illness and warnings to keep those foods away from her, they did when she vommitted. When she had to be hospitalized on average of once a school year for dehydration. She would go back to school with I.V. scabs and bruises. It was also a Christian school and the pastor would visit at the hospital.
Even after she has been diagnosed with Celiac and Eosinophilic Esophagitus, public school environment is just too much for her system. (I had made the decision if she ever needed a feeding tube she would not be in the germ filled school environment with an open port in her gut. Thank God it did not come to that!)
There are other alternatives for education. I contacted the hopsital social worker and asked what to do about the missed school days. (At least I knew I was starting a positive proactive paper trail.) You can get your student a "homebound" education. (At least that is the law in my state) Speaking with a hospital counselor can also help blow the whistle on these piss poor doctors! The counselor can also help you inform the school you are looking into/ aware of your patient's rights. (so it may be better that you don't have a history with this hospital.)