Dorothy,
Spreading or progression is the most likely cause.
I don't believe the CoQ10 has anything to do with it. I take it every day and have had success with it and my other suppliments as well as my meds- in keeping my PN under control.
I take ALA, CoQ10, Fish oil, folic acid, Methyl B12, B complex,
Lyrica & Tramadol.
Stopping progression is still something that is a 'hit and miss' proposition.
Only your Neuro & PCP can advise you there.