Hi stargate
I agree with Bayleys reply.
also I do not have knowledge of Cerebral Venous Sinus Thrombosis
Happens allot that people have to increase the dose of the med they are on or switch to another med because the body becomes used to it and the med dose not work as well after awhile.
allot of folks take Tegretol or neurotin . at least you have a dx and are on the right path and once the right med or combo of meds is found you will be able to control the pain better.
Let us know how we can help and ask questions, keep us posted on how things go..we care and are here for you.
PEACE
BMW