I too got 0 points from medical - and appeal awarded me 24 points. If you were getting higher rate mobility at the time of the medical you should be able to evidence that you can only walk less than 50 meters which should score 15 points on its own. If you can evidence this from that time its best to send to tribunal before but do take with you as they did ask me if I wanted to add anything else. It is worth brining this to their attention as in my medical I was unsure of they had read the additional info. I found the doctor was easier to communicate with and asked more relevant questions based on the descriptors so its worth reading them so you can answer in relation to each one - you might want to write your responses to each of the relevant ones down and submitting these as it is easier to refer to written info and helps with managing at the appeal
Thanks for the responses i feel totally let down by a system that is there to protect people when they most need it, i will of course appeal against the decision but i am so stressed out at the moment cant think straight.