I am so sorry to hear that the cancer is back. My prayers are with you. My trismus sneaked up on me too, and has become a real problem regarding any dental treatment and throat problems, so obviously I am not going to be of much help to you.
SCC Base of tongue stage 4. 10 hour operation Radical neck dissection and hemiglossectomy 23/10/06 35 Rad treatments and 3 high dose Cistplatin Dec 06 - Feb 07. Ex casual smoker 6 to 8 a day - casual drinker. Very fit and diet conscious.