If you live in the UK, then you might consider signing this petition:
https://www.change.org/p/justine-greening-stop-penalising-children-with-medical-conditions-for-their-attendance?recruiter=305023793&utm_source=share_petition&utm_medium=copylink&utm_campaign=share_petition&utm_term=219938

Have signed. Thanks Simon.
You don't actually have to be from the UK to be able to sign - and well worthwhile for all of us as this effects us in all countries where our children are actually treated worse than someone with a physical medical condition. No child suffering any physical or mental health condition should be penalised for their attendance. Until schools and educational institutions understand this - our kids will continue to be discriminated against.
Linda