Tony, sorry to hear about the pain. I agree with David, upthread. You shouldn't have to deal with this. Doctors seem to swear by tramadol but it didn't work for me when I had my first tongue surgery in a day clinic and ended up in agony. Funnily enough, what did work was panadol and voltaren suppositories.
I really hope you get this sorted soon. Good luck!
Maureen

1996, ovarian cancer surgery + cisplatin and taxol.
September, 2007, SCC of left lateral tongue. Excision.
October, 2009 recurrence in scar tissue, T1NOMO. Free flap surgery from left wrist - neck dissection. 63 year old New Zealander. No chemo, no RT.
February, 2014. New primary in left buccal mucosa. Marginal mandibulectomy, neck dissection, right arm free forearm flap. T1N0M0 but third occurrence and some areas of concern: RT started 8 April and finished 19 May.