When my feet begin burning it tends to be very much the same in both feet. The symptoms also tend to subside at the same time. Anything I can deduce from this? (I put biofreeze on just 1 foot as an experiment and that lower leg is obviously reacting more, even in places it didn't apply it)

Would it indicate a problem further up the nerve chain? Back? Brain? Is it just a coincidence? Is it even worth speculating?

My feet are also sensitive to pressure so standing, walking, rubbing tends to induce the pain more, so I try and stay off my feet and barefoot as often as possible. Hard to be productive that way, and it makes going to work a miserable experience.