Gout

I am a hairdresser and on my feet for long hrs. my knee and ankle on left started swelling,then i started getting sharp pain that hurt so bad i couldn't put foot down. I notice that their is a bump on the outside of ankle toward curve of my foot and it looks like a slight blue color. the other day i was mopping and pain was so severe i couldn't put pressure on my foot. i do have back problems can anyone tell me what up? i did see state dr for disability and he stated that it was tarsol tunnel,does anyone know anything on that!