Hi Diceman24
Have a look at the Guide to PIP Claims and Reviews and read through the information on this question - pages 79 - 86. It can be confusing because this question isn't about the physical difficulties that a claimant has in walking. (That comes in the next question).It is relevant if a claimant has a mental health condition, learning disability or sensory or cognitive impairment.
So have a look at the information on that question and see what could apply to you and what links there are to your muscular dystrophy and any other co-existing conditions you have.
If you have any further questions come back and we will try to help.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems