Ive been on pain meds for 5 or so years, and am curious if anyone else who has taken them for that long, has experienced them 'not working' anymore? we build our tolerance, and eventually its not the same. does that mean its time to stop taking them b/c they arent working like they used to? or wein down to get tolerance lower? does this get to a point where regardless of how hight the dosage, there comes a point where they stop working all together?