What Causes Severe Left-sided Foot Pain And Discoloration In The Knuckles?

I have had really bad pain in my left foot for years now been to see Dr a couple times but couldnt find anything wrong but not very good hospital.my second toe has a bulge in the knuckle and is slightly purple and same on the second knuckle down on big toe same foot,it s hard to walk and stand for long periods it feels like when you were a kid and you would jump off a swing and he foot would get that pain in it that s how it feels all the time