Time to look for a neurosurgeon that will put in a permanent patch.
Try looking at surgeons that do a lot of pituitary surgeries (CSFs leaks happen at times with those surgeries) and they may take you on with more than a blood patch.
Large universities usually have pituitary centers - look for a very very experienced surgeon, preferably using an endocopic technique so they can see more.
In the mean time, are you laying as flat as possible and using caffeine to help?
Good luck.