Leg Pain

Maybe I am not using the right language but I can never find what exactly is wrong with my legs.  I injured them when I was a child a lot in fact more then most children thankfully I never broke any bones because I have a very healthy and dense bone structure but my tendons I think are stretched to the limit.  The pain in my knees continues to get worse and now I have this rippling effect down my ankles and thighs and my hips and lower back are starting to pain me greatly, it hurts to lay down and it hurts to stand and when I sit my feet fill up with fluid and swell.  The worse is this last week my right leg my sortive good leg the left one, has started to have this sicking pain in it, I say sicking becuase every time it hurts I feel like puking.  I have gone to the doctor and they said physical therapy would help with my right leg  but because I was on welfare health at the time there are no doctors that will take that kind of insurance.  It has been two years sense my initial injury the pain is still the same the knee locks then pops out and hurts like hell this pain I have gotten used to but the other leg the pain in it is a whole new kind of pain.