For the physical withdrawl, if you've already done a couple days, you are almost through. It takes about 3 - 5 days for the worst of the symptoms to pass.
Drink alot of water, eat light meals (even if you feel you can't keep it down, eat a little something), tylenol for the aches and pains, hot baths and showers for the aches and pains, and try Tylenol PM at night so you can get a little sleep. You won't sleep very much for a while, but your sleep patterns will return. Try doing things to keep your mind off of the withdrawl.
I came off of opiates cold turkey, and I know it's horrible, but it can be done. You can get through this. You seem determined.