complications from a broken ankle?

I broke my left ankle 4 years ago, in 4 different places, requiring a plate and 7 screws, when we talked with the surgeon she said it would swell for about a year, and here it is almost 4 years later and it swells up almost on a daily basis, I do work at a retail job about 10-20 hours a week, and have memory foam inserts in my work shoes, and try to take it easy while i am at work, and on my off days i ride/drive my horse and pony, but ice and wrap my ankle when i come home. some times when i am rubbing my ankle i can feel the screws under my skin, and it gives me the willies!

Could I be allergic to the implant? I try to take care of it and not be too hard on it, i switched my style of riding from english to western to help take some of the pressure off of my ankle. what could the swelling be from?