What causes the cramps,insomnia,cold sweats during oxycotin detox

It is the body's reaction to withdrawl and is the reaction for a number of different types of substance withdrawl. Fortunately in all but alcohol it is not life threatening even if it's a very tough time. I would advise a medically supervised detox for that reason.

Sadly, one doesn't notice all the many changes a body goes through "acquiring" or accommodating the addiction because one is too busy being high and distracted. Consider this the reverse process.

Everyone is different and getting there bodies back to there own natual patterns can give any rections!