Just a quick note to say hi! I can't believe your post is almost word for word the experience of my best friend who had the same chemoradiotherapy as you-internal/vaginal and external beam. I hope that since your original post, you've found some resources.
Regarding the ONS, the Cleveland Clinic ha sone of the few ONS trials in the USA.
Check with the nuerology dept.
I have HC also and I'm getting an exam for an ONS in Feb.