No pressure in the clutch

I just replaced the master and slave cylinder, the third time in the past year. I also just replaced the entire clutch. Flywheel, throw out bearing, the whole nine. Then I was driving down the road yesterday and all of a sudden. My clutch lost pressure again. It did so until I pulled into my driveway and turned it off. Then when I turned it on again. There was a little bit of pressure back. But I chose to try to bleed it again to make sure I wouldn't get stranded and now I have no pressure and it will not bleed. I have not a clue as to what to do from here. I'm not sure of anything else it could be. But I need help ASAP please if you have any ideas please help.