Whoooa. That's two years old. Where did you buy them from? They usually have an expiration date either on the website (like it'll say for one year use) or bottle.
Most contacts lenses have an expiration date for one year. Gee most contacts in GENERAL don't even last that long. I'm sorry to say, but you might just have to throw them away. I'm sorry if you see it as a waste of $50 dollars, but contacts aren't the kinds of things you can keep forever and ever (as far as I know anyway).
At two years, I would personally just throw them away to be safe. But if you want to try and risk it.. Continue soaking them and try them again I guess. ._. If they are hurting your eye, take them out. Check if there's anything on the actual lens. Check if there's an eyelash poking your eye. If there's nothing, then it's most certainly time to throw it away. Sometimes the tiniest nick or tear in a lens will drive your eye crazy.
Tore just a tiiiiny bit of the edge of my regular lenses. Thought "Oh it's so small. It won't matter. Yeaaah. My eye said "nopenopenope"
If you decide to go with a new pair, circle lenses are cheaper (but are just as safe): http://www.pinkyparadise.com/Default.asp