HI My Name Is Travis I Have Been Taking 5

HI my name is travis i have been taking 5 lori tabs a day for 5 years now, It does not work as good as it use to im running out about a week early every month now,AND DONT KNOW HOW TO TELL MY DR. i dont want him thinking im abusing them,I have servere back problems, it seem like this happens every winter. Should i ask him if he can upper my doses to 6 per day. thanks.