you already know that you have an addictive personality, much like mysef.. i definitely hear the pain in post.. you already know what you should do with these pills.. i like what someone else has already said.. at 46, trying to restart a life free from drugs is not easy, especially since you don't know how long your run maybe..
i would either flush all of it, or give them to a good friend and make there day/week/month... i wouldn't sell them, as it seemed like your uncle just wanted to make someone happy with them and thought that he was doing that for you.. just get rid of all of it, minus the weed.. i think once its out of your posession, the need for anything harder than mj will be gone.. i think you only feel that way now as you know that you have something that can take you much higher than mj..
think about how your life was when you used to smoke rock.. although opiates are not coke, they are even more addictive physically.. just do yourself a really big favor and get rid of it...