I found this article (below) very interesting. It suggests that both chemotherapy and radiation to the spine (an unintended impact of radiation to the head and neck such as in my case of tonsil SCC) can result in peripheral neuropathy. Of interest is the statement that for some people this will improve or resolve in 6 to 12 months (but not for everyone). This fits with what a friend was told about the "buzz" he experiences when he tips his head forward; that it should go away with time:

http://www.greenhosp.org/pe_pdf/cancersymptom_neuropathy.pdf


47 yr old male non-smoker, social drinker, fit. Jan'10, Stg3 rt tonsil+rt neck SCC, HPV+, rad+chmo Vancouver Cda. 2yr clear Apr'12 London UK. Apr'13 mets recur to lymph btw left lung & aorta, 3x Cisplatin+5FUchemo+20 rad, was all clear but 6-mo PET-CT shows mets to pleura around left lung, participating in St 1 trial of GDC-0980. GDC lost effect and ended July'14, bad atrial fibrillation requiring hospitalisation, start more standard chemo 10 Sep 2014.
Sadly has passed away, notified Jan 2015.