Mamaswans, the first step might be to just call them up and ask how to appeal. This really would need your doctor’s support.
JeremyH, one thing to look for in a bacterial probiotic is CFUs per dose. CFU stands for “colony forming unit,” and it’s just a fancy term for a single live bacterial cell. The prescription-strength VSL has 900 billion CFUs per packet. SInce there’s no real generic equivalent, and almost no regulation, you can at least use CFUs as a way to roughly calibrate how much you’re taking.