Try posting your question on the LDN website
This site is for LDN use only and the administrator seems to be very well informed.
I am sorry that I am unable to help you, but I do not suffer from pain. I do know that narcotic pain killers do not work with LDN. My understanding is that you would have to take a higher dose of the pain medication in order to achieve the normal pain reduction. This is why they tell you to go off LDN if you are having surgery.
Also, one week is such a short time - even a month might be hoping for too much.
I started taking LDN six months ago to stop the MS progression. So far, so good - I am exercising more and getting stronger.