I've done it before too. Fentanyl patches, & a little hydrocodone for BT pain. Was easy then, because the pain went away (long story but basically 10 years of horrible chronic back pain was cured by the right kind of exercise - jiujitsu), & that made the fentanyl give me tons of anxiety. So I started tapering the patches & eventually got off 'em. Was easy because I never felt anything from the fentanyl patches other than pain relief. When they started causing anxiety it was a relief to get off of them. These short term hydrocodone pills are MUCH more addictive. Tolerance rises quickly & they give an endorphin rush, making it mentally harder to kick. This time it's also harder because I'm also getting off Effexor, which I've found belatedly is probably the worst anti-depressant to be on. Thanks to my crappy shrink. Anyhoo... the pain started to get bad again, which was why I got back on these damn hydrocodones, but I've been working on the exercise again & it's going away again. Now to get back off 'em. I'm also having pain when between doses, which I assume is more withdrawal pain than bad back pain. Fun fun fun.
BTW whatever exercise you can do w/ your health problems will help w/ the withdrawal. If your pain is from back problems, exercise will help the pain anyway.