I've had sore feet too at times, usually when my BGs were running really high for a while. Part of it was caused by ill fitting and unsupportive shoes , a problem that got sorted as soon as I started work and could afford decent ones again. I was sometimes a sharp pain in the ball of my foot as though I've been stabbed, and sometimes it was cramp-like, other times it was a hot, burning sensation. And then there was the incredibly sensitive big toe, once the dog's whiskers just brushed me and I had to scrape myself off the ceiling because it was such a shock. All of these symptoms have eased off now my BGs are lower though.
I nearly forgot, I treated myself to a footspa with massage attachments and use it regularly, it really helps.