I worked as a camp counselor at an overnight camp. Even in a fairly rural area in the midwest we had access to excellent medical care. Our health center was staffed with nurses and we had a doctor on staff who was always on call. It's not the same as "mom" but as a counselor we took great care of your kids and I expect your kid's counselors and the camp nurses will do the same!
Send him a care package and stay calm on the phone.