A lot of tylenol... In all seriousness, how long have you been on them? That will have a lot to do with weather or not you'll have withdrawal symptoms. You'll definitely have a shitty time (literally and figuratively). Depends on your definition of withdrawal, but pain will be worse, not much will be pleasurable, diarrhea which comes with weight loss. The acute phase lasts about a week or two. Post-acute varies. Likelihood is that yes, you'll have symptoms from the discontinuation