The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
While taking Kratom gradually cut down on the other pain killing drugs until you are only taking Kratom. One man on this site describes quiting his alcohol addiction and maintaining with 12 grams of kratom a day. That’s approximately 6 teaspoons twice a day. I consider that a lot but he didn’t and was happy he could maintain with that dose. Your addiction might be quite severe and you may have to up the dose of Kratom quite a bit to overcome it. Be sure you do are not eating an inflammatory diet . avoid sugar, flour products, dairy (the latter at least for awhile).