I am sick of having heroin withdrawals, and desperately want to quit.?

I didn't think I was addicted to heroin, until I didn't feel like using anymore. I do not have an addictive personality, what-so-ever. But when I started having muscle/bone aches, insomnia, nausea, etc... I looked it up and found out it was withdrawals. I am supposed to be prescribed xanax for my anxiety. Would it help if I went back on it? I have researched and people are saying to just deal with it. But I have never shot up. Don't need rehab. Just need something, anything, to subside the pains so I can work and sleep peacefully. Are there any sort of vitamins out there that would help? I'm sick of having to sleep on the futon because I feel bad for keeping my fiance awake with my flailing. I used again recently just because I had so many important things to do and couldn't handle the pain. I want nothing to do with morphine, or anything of the sort. Help?