Well all withdrawal is bad. I would think 2 weeks of 80 mgs daily shouldn't be too hard to get through compared to the cold turkey WD's from my 2+ years of daily heroin usage. That withdrawal was like being the devils personal slave and was intense. The cold air, and cold metal slab known as a bed in my jail cell sure didn't help. My guess is you will feel better (not 100%) after 4-5 days followed by a week of depression/insomnia.
Let this pain your about to suffer for a week or two be a reminder of why opiates are the devil since you didn't learn from the first time you went through withdrawal from 50 mgs, and hopefully it prevents you from riding the train to hell again. As for me i didn't learn until I was truly fed up with my life and habits, and suffered through WDs many, many times. Low doses of Imodium helped me tremendously during my many WDs along with exercising. Sound impossible during WDs I know...but its truly rewarding if you can find the strength to do it. I just kept going and telling myself all the toxins are leaving my body from sweating and motivated me daily to keep working out/exercising.
I hope the best for you. Stay hydrated and keep your mind busy. If you continue to use then you will pay the toll again.