No Matter what, just remember there is a point by like 5 to 7 days after you quit cold turkey, you are back to almost normal again, its awesome. Just stick it out. Get some immodium or something like that to help with it too if you can, or just no name brand. Not only does it help control the tummy issues, it also is thought to help releive WD's a tiny amount, and any bit helps. Flush everything else in the toilet.

In two weeks you will feel perfect and its all worth the struggle.

Side note: Personally I wouldn't even say do Methadone, you can quit Opiates cold turkey and its fine, but quitting Methdone can hurt (physically), wheras opiate WD is just mental, won't kill you. Benzos too, they are dangerous. Opiate withdrawal hours your body, like a bad bad flu, sore muscles etc. But Benzos... ugh... your brain is just dead, and it can actually harm you quitting them, so if you JUST started benzo, ugh... shame. Shame you cant just get induced into coma for 2 weeks and wake up no WD's lol.