I told ya bro, it takes about 11 days, maybe longer depending how long you've been on. Even though you claim only 1-2 a day for a year, your body is physically addicted to the pain meds and it needs to start working without the dependancy of them. Tylenol isn't addicted and yes it's in vicodin, but it's not making you or will make you addicted, it's the hydro that's in it.
Take 2 tylenols for the pain and take a few imodiums for the diarrhea. Immodium is a cousin of an opiate, but it doesn't cross the blood brain barrier, meaning you can't get addicted to it, but your body reacts in a way that it won't wd as hard due to the immodium settling the stomach down. Trust me on this one. Just follow the directions on the immodium ad and it should help you with your diarrhea, but some addicts withdrawing from opiates will take up to 8 immodiums to keep the stomach in check, everyone is different.
There are ways of wds without professional help, and if you can do it, that's awesome, but most will seek professional help and will need drugs like "suboxone" which is an opiate but without the euphoric feelings..and then they taper you off with that.
If you do it on your own, you gotta do it with some over the counter meds like tylenol, immodium and night time cough meds to help you sleep and help you with the pain.
There is another natural herb that a lot of addicts are using to withdraw with great succes. It's called "Kratom". You mix it up like a tea and drink it and I think it's like an opiate in a way that it tricks your body like if your high on real opiates and it even gives you a high feeling. I haven't tried it personally, but if anyone here has, now's the time to chime up bro. If you need anything feel free to pm me.