If you are suffering from opiate withdrawal then there are a few options that you can consider.
One is to tough it out cold turkey and try to make it through the withdrawal without taking any more medication or opiates of any kind.
If you do this then eventually you will be completely drug free, but of course it is very difficult to make it through this detox phase without any help, and thus many people in this position end up relapsing.
One of your options is to go to a drug rehab center.
If you have been hooked on pain pills or heroin then they can give you medication there at the rehab clinic that will help to taper you down from the opiates so that you do not get so sick.
Instead of going through 3 to 5 days of misery, they will be able to keep you much more comfortable for the few days of your opiate detox and also help you to learn a bit about how to stay clean.
After you are detoxed you will likely go into their residential program and that is where they will try to teach you how to live a clean and sober life.
Another option you have is to stay hooked on an opiate of some sort for the long term.
Some people actually go on a maintenance dose of an opiate on purpose, just for this reason.
If it can help them to stay off of street drugs then it might be a better option than others.