I am also suffering from chronic back pain ..so I can understand how bad it is.
But I am 100% sure that you will be able to control it...as my experience says that sometimes these chronic pains don't leave you completely but yes if you adopt a healthy lifestyle and can practice YOGA regularly, you can definitely control this chronic pain.
At least Yoga works for me
and of course loosing some extra weight always helps so best of luck for your battle !
P.S: You can check these video links for "Yoga for back pain "..hope it will help u