I Fell Over A Year Ago And Hurt My Foot

I fell over a year ago and hurt my foot and it has never gotten better it burns all the time it has gotten so stiff I can't bend my toes it swells changes colors I can still only walk on my big toe and only with alot of pain I have had an M.R.I. and it showed nothing I had a nerve test it showed nothing as well but the night after the nerve test I ended up in the emergency roo because the foot never stopped feeling like the nerve test was still being done and it swelled to about 1 and a half times its size my doctors just tells me there is nothing wrong but can't tell me why I am in so much pain or why it swells and changes color I am slipping into such a depression because I can't walk without feeling like someone is sticking a hot pocket in my foot I have stopped eating because I hope if I can loose a bunch of weight it won't hurt so much not that I am that heavy 128lbs but I am on day 5 without eating please I need someone to help me it can't be normal to be in this much pain and have nothing wrong and my doctor won't even talk about it anymore