5th bone Metatarsal Fracture

I work at a grocery store in the meat department. I am on my feet 8-10 hours a day, sitting for maybe 15-20 minutes, break time. I carry pans of meat, pans of meat, boxes of lunch meat, big turkeys, big hams, etc. I am a meat wrapper and I cut meat sometimes. All I do is walk and carry meat. One day I had been clocked in for about one hour or so and I was going to the meat cooler to grab a 40 lb. box of chicken to start traying up and wrapping for a customer. On the way to the cooler my foot bone broke. I actually felt it snap. I did not have anything in my hands at the time, I did not trip on anything or run into anything. Workmans compensation deninded my claim just because I was walking only. I figure with all the weight of the meat, etc. that I have to carry everyday just wore my bone out and it just snapped. If I cannot walk and carry merchandise then I can't work. I have been off work for 10 weeks and if the bone does not heal they will put a screw in my foot, which means surgery. I think its wrong Workmans Comp will not cover me because I was walking at my job. Can a doctor please give me any ideas on how to help them see this different. Thank You, CountryLady