Can B12 def cause very painful feet? I work 12.5 hour shifts and they start to hurt after just a couple of hours so by the end of the shift I am in a lot of pain. I have been diagnosed with plantar fasciitis and wondered if this could all be part of the nerve problems. Been home 2 hours and resting but my heels are still throbbing. My toes go numb during the day (my shoes are not tight) and sensation only returns if I take my weight off my feet. Wondering whether to go back to my podiatrist. If I do 2 consecutive shifts I am in pain from the second I get out of bed on the second day so it just gets worse as the day progresses (occy health have said I am not to do 3 consecutive days for this very reason). I have been given insoles to correct my posture but this makes the pain worse, but they are comfortable in a normal daily situation - just not when on my feet at work all day. It makes my working day quite miserable.