Headaches, sore stomach and aching bones? Can it be withdrawal from having no pain killers/codiene?

Sure, but. It could also be a long list of other things, many common. The severity and duration would matter. If it is w/drawal - try to bear it - it will be worth it. And you can get medical help for it too. Have an exam if these seem to be unrelated at all. It can be wise.