Welcome to SR!
I don't know the answer to your questions, as crack was my demon. I do know there are several people here, who have been through the same thing you are going through. I think if you read through some posts, maybe even search "opiate withdrawal" you will find some answers, but a friend, here, told me it took about a month for her to get her energy back...she took way more lortabs, though.
I'm glad you're here, there are some terrific people here with a lot of support. The thing is, we have to learn to live life without picking back up...that's the hard part, and where the support comes in. A lot of people go to AA or NA (there are usually more AA meetings than NA), but there are other avenues of support, too.
Keep posting and reading. More people will be along to welcome you, and answer your questions.
Hugs and prayers!
Amy