I think that not even if the instrument help directly with the disease it is very meditative so it relaxes and reduces your stress.
And that is something beneficial for any disease.
I think you can start with a PVC didgi like AJ has pointed out. So, you can start in less than $5. He is a experienced player and has published some great material on how to play a didgeridoo.
Here are some free tutorials that will help you to learn for free also. http://knowledgemaps.org/learning-journey/1023/learning-to-play-didgeridoo
