Hi Andrew,
My boyfriend martin is going throught the same thing. Everything seemed to be going well and better and now 12 weeks after treatment his tongue is like sandpaper again and even wet things taste dry. He has terrible salty taste again and his speech is strained because of the dryness of the tongue. The consultants told us if taste and saliva came back before, they would come back again, just to be patient, but it seems like a big set back.
Has anything improved for you since your last post?

Girlfriend to Martin 49 years old at diagnosis
Diagnosed with SCC unknown primary June 2008.
Cancer found in single node Stage N2A (3 to 6cm).
Tonsilectomy 16th june, Radical modified neck dissection left side 30th june.
30 TX radiotherapy ended 9th October
First comparative study scan came back clear