To the OP, I swear by exercise. Nights were usually the worst for me, however waking up and not getting my fix was equally aggravating. You just don't want to wake up. However, when you do, and you manage to eat or drink something, your blood sugar goes up. Even if you do not eat, your blood sugar rises and falls in cycles of about 2-3 hours. Cereal will get your get your blood sugar up the quickest. Exercise will do that even faster. I know when I was w/d'ing the absolute last thing I'd want to do is exercise. But the halo effect of exerting yourself to the max will last 2-3 hours and the symptoms should diminish significantly, or all but disappear if your tolerance isn't that high and you've been using for 4 days. Just do pushups until you fail, until you can't do anymore, then do 1 more, then 1 more, then rest 10-15 seconds and do it again. When you think you can't do a single one more, pretend you're wolverine and scream until you get another one out. Then another. Within a minute you should notice the chills stop and the yawning stops. For me, my hearing gets muffled like I would get from opiates. But you really have to go all out, and keep doing it even when your brain says no more.
The reason at night you feel the worst, is because your blood sugar is 0 and your body is not replenishing it with food or exercise. Your body thinks it's time to go to sleep and starves your blood of sugar to help you sleep (you know that afternoon lethargy?). Ever feel super sleepy and get up to pee or brush your teeth, then you can't fall asleep? That's your body releasing blood sugar because it thinks you plan on staying awake. Now, if you can't get out of bed, just wishing someone would put you out of your misery, then exercise is one of the most difficult tasks you can do. But if you believe me that the reward of doing 30 pushups is equivalent to 30mg of hydrocodone, would you force yourself despite everything you feel?
I discovered this when I had to hide my symptoms and go shovel snow. After I was done, I was feeling better and it lasted for over an hour. I had a gram a day iv oxy habit, 3 oc80s 4x a day. No joke. I know where I'm coming from when it comes to w/d's. I even precipitated withdrawals once with that habit. Don't ever want to think about that.
Back to exercise. It has a great anti-anxiety effect as well. What I can suggest to you is to take some Immodium to keep your GI in check, L-Tyrosine to help speed up your dopamine production, and eat (drink if you cant) sugary stuff. Like I mentioned earlier, cereal will get your blood sugar high quickly (but it will fall quickly too)... if you want to sustain yourself for longer, eat fruits or drink juices. Do that on day 3, 4 and 5. Your transition will be seamless and you will associate your recovery and feeling better with exercise. Then when the physical w/d's are gone, you will already be ahead of the game tackling the psychological symptoms. Sitting around (and not exercising) will only make your thoughts wander to opiates and trigger cravings. Good thing is you might even get hooked on exercise, because you will associate it with dopamine. But that's the good stuff. It will help you down the road.
