Hi Kay, my daughter had a bad time on a water ride with her neck but I think it was more a proprioception thing - she concussed herself on the back of another person because she didn't anticipate the end of ride! I would go and follow my gut feeling on it -
I think some rides - those who have been recently may be able to confirm but they say if you have neck or back problems etc 'do not go on this ride if.... you have the following (they are obviously not going to say hms/eds but I hope you get my drift
Discuss with your doctor obviously if you feel it appropriate, I would never advise anyone not to! I hope you go and you both enjoy yourself. Laugh and have fun. Let us know how it goes. obviously rides which are difficult to get in and out of should be approached with caution but I would also say don't be afraid of keeping people waiting why you do things in a way that is suitable for you. If you don't want to go on a particular ride because of a gut reaction you can always say - you go and I'll take a fantastic photo for posterity!
A search on Alton Towers brings a plethora of info for disabled visitors -
There are reduced rates for disabled visitors and those with mobility problems should report to Guest Services as soon as they enter the park. Wheelchairs are available to hire here for a charge, and you can also get a Disabled Visitors Guide here. Most queues are not suitable for wheelchairs and those visitors with mobility problems so the Guide will give you details of how to get on rides. The majority of the toilets have a disabled cubicle and staff are very helpful.
it could be worth a little investigating by way of internet searching and ringing in advance on disabled access etc. Those that have been recently may be more helpful than I!
Take care - nonya