My husband had a similar feeling and occasionaly lightedness about 6 months out fromt treatment. We too panicked that it was cancer related and were very upset for days maybe longer. He was DX with mild high blood pressure which is now under control. Cancer makes one hyper vigiliant. Both a burden and in some cases a blessing. Glad he got checked out and that the news was good.

Caregiver Husband Bob SCC tongue t2nomo Partial Glosectomy/neck disection 6/04 rad ending 9/23/04
Osteoradio-necrosis of the Mandible (ONJ) DX 6/09 Surgery 7/2/09 mandible resection/ several teeth extracted/ neck dissection NO FLAP and aggressive antibiotic therapy.