How To Treat Chronic Contracted Muscles?

I fell two years ago whering flip flops and now from my foot pads up through my calves and thighs and especially in my stomach area , I have chronic contracted muscles. I have to cut my walks down to 20-25 minutes because my legs get like wet noodles if I stand up too long. Any advice? What type of doctor should I see? I spent a year with a neurologist doing MRIS etc. but I'm wonering if I could seek some more help?