My Left Leg I Swelling For 3 Years, Starting The

My left leg i swelling for 3 years, starting the knee till the ankel, my doppler was normal as well MRI on the knee showed very mild osteoarthriTis in the knee! My leg some times is hurting a lot and swelling when im standing up or wearing heels as well when i bent my leg. I've been to the gym 5 months ago with personal trainer in order to strenghthen my muscles but with no results!! Any help?