http://www.neurologyreviews.com/jan02/fluid.html
Many treatments are employed for cerebrospinal fluid leak headaches, Dr. Mokri noted. The use of caffeine “has been somewhat effective in some of the patients, while analgesics and nonsteroidals are used by others. Corticosteroids have also been used, but the claims of effectiveness have been mostly anecdotal. Furthermore, some of the patients make spontaneous recovery after variable periods of time.”

http://uimc.discoveryhospital.com/main.php?t=enc&id=584
CSF leak following a lumbar puncture can be treated with caffeine, and hydration. A blood patch may be placed at the site of the spinal tap. This is a procedure where the individual's own blood is injected at the location of the spinal tap, sealing the hole so as to prevent the leak.

http://www3.interscience.wiley.com/j...TRY=1&SRETRY=0
A 69 year old man presented with headache on arising and relieved with recumbency. His clinical presentation, laboratory data, response to treatment and radiographic evaluation were consistent with spontaneous low cerebrospinal fluid pressure from CSF hyperabsorption. Cisternography showed rapid accumulation in the kidneys and urinary bladder, without evidence of CSF leak. His headache was eventually controlled with two blood patches and oral caffeine.

It was something I know my friends did and I know my doc said if I got a bad headache after surgery to lay flat and drink coffee - it does not work for everyone, but it seemed to help a bit.