This is a question that will require a longggg response but I feel this thread will suit you best
Read this entire thread. Yes its a lot of info but if you actually want the best shot you'll invest the time and read as much as you can.
My input:
advil: helps more than you'll realize
immodium: same as above
clonodine (if available): ditto
EXERCISE: as much as you can. Sounds counter productive, but if you're going to be laying in bed for a day not sleeping, you might as well get up for a bit to walk around and hopefully tire yourself out. if you can barely walk for 5 minutes every day, walk for 5 minutes. better than laying in bed kicking, might as well be active, because 1) it will help with getting endorphins going, 2) it will be healthy for you past the endorphins, 3) if you manage to do enough it will, hopefully, tire you the fuck out enough that you simply pass out.
eat whatever you can keep down; junk food, fruit, ANYTHING you can manage to eat, eat it. Its very hard to eat healthy normally, let alone during withdrawals. Yes eating healthy is obviously better, but if you cant keep down vegetables and CAN keep down junk food (which is most likely a result of the diets of humans being changed drastically the past 50 years), then by all means eat junk food. the more food energy you have the easier it will be on your body
drink water: lots of water. they recommend 8 glasses a day, if you can try and double that b/c you will be sweating out an obscene amount of water. Gatorade too a bit or something of the likes. I only drink water and milk now, but if you eat anything you replenish electrolytes from food too (esp foods high in salts like sodium or potassium). If you DONT eat then gatorade is doubly important, but if you DO eat don't worry about electrolytes as much.
Basically down whatever you can keep down.
jack/jill off: if you can. basically 'exercise' in the sense that it will tire you out and release endorphins. although i know for a lotta people the last thing they wanna do during w/d is rub one out. but if you can....its a good time sink too!
hot showers: obvious.
STRETCHING! Omg this ones a life saver and honestly what i used to do when I would be in bad w/d. Stretch stretch stretch. If your legs get as bad as mine, do what I call the "catcher pose" where you bend your legs like a baseball catcher. Nothing feels better than stretching out those aches and pains, seriously. Its almost orgasmic, the one downside is that the feeling fades rapidly after you stop stretching. I used to actually sit like a catcher with my knees bent and out to the side for sometimes 20-30 minutes because it felt that fucking good. I really cannot describe the intense pleasure i got from this lol.
I personally say NO BENZOS. I am totally against benzos during opiate w/d b/c in my experience and observations they lead to NOTHING but a new addiction and/or relapse. I have never IN PERSON seen someone successfully use benzos and stay away from the opiates and get off of them. they always end up hooked on benzos or relapsing because their inhibitions are gone, and they're all barred the fuck out.
To each their own, but I vote against benzos every time.
For more info see the thread i've posted,