CiMo,
First and foremost, I know what you are going through. I've been a chronic pain patient for around10 years, and I understand what you are dealing with. The doctor has to follow a few protocalls when prescribing narcs and he has to start you on the lowest dose possible. Call him and let him know that the 5's are just not cutting it, depending on your relationship with him I would tell him that you have experimented a little and know that you need a higher dose. Call him as soon as possible. Honestly he probably didn't expect it to work. Additionally, DO NOT try to get totally out of pain, it can not be done without becoming addicted, taking narcotics long term is like dancing with the devil, it is a scary thing and you and only you can keep your narcotic intake under control. I still have days that the pain is so debilitating that I can't get out of bed. I have a bad back like you, I have had five surgeries on my spine, have DDD, some weird bone disease, etc. The pain can be excruciating, be honest as possible with your doc and get the help you need. Also check your pm's.