get a new one, or remanufactured one..
ive had master mechanics say they have rebuilt some hydrualic stuff and for it not to work 100% like new again / or leak.
no need for the head ach either right?
any ways, it's probaly time to bleed that sucka any ways..
so when your down there, break the line lose and drain the hole line out and the slave cylinder./ master cylinder resivor.
doing this is a good thing because hydrualic fluid becomes containated with water easily. also picks up dirt and dabrea which changes the fluid color along with getting burned/ hot.
once you have the new part on, and lines together.
fill resivor with new fluid, and crack open the bleeder vavle, and allow to drip for a few minutes, keeping an eye on the resivor level,
at this point a friend realy comes in hand, close the bleeder vavle, and pumped the clutch peddle roughly ten times, and hold the clutch to the floor, w/ the clutch to the floor have a friend or you, who ever isn't working the clutch, climb under and crack the bleeder vavle, fluid and air will squirt out, close the vavle, and repete a few times keeping a watchful eye on the resivor, dont want this to run dry or you will be in the same boat you started as..minus this leak..
any ways.. almost forgot, once you open the bleeder and the clutch is on the ground, it will stay there, since there is no hydrualic pressure from the clutch to push it back so close the bleeder, and you'll probaly have to pull the clutch off the ground. but no worries, it was designed this way.
hope you get her figured out!