Hi runninglady
and welcome
This is just my 2 pennies worth here, but you won't need any insurance for your little one, everything is covered by the NHS including meds and scripts.
On another note, I work with little Autistic people and the rate of bowel disorders in my school is very high. Has she been tested for Coeliac?
Also, the National Autistic Society will help you with any queries.
Also, the book 'Breaking the Vicious Cycle' has info on the Specific Carbohydrate Diet which is beneficial for kids on the Autistic Spectrum.
And finally, pictures, symbols and drawings will help your little un to communicate her pain, eg, a sad face, a happy face, and where it hurts, a drawing of someone rubbing tummy, or head etc, that's a good idea!
hope your appt turns out to be a good one and she gets all the help she deserves.
good luck and let us know how you get on
lotsa luv
Joan xxx