1990 Ford Probe clutch pedal losing pressure

I have a 1990 ford probe 2.2 liter 5 speed.I started losing pressure in my clutch pedal one day and the next day I lost more as I drove. Eventuall, All pressure was gone and clutch pedal would not return and I had to resort to pulling it back up with my hand. I stopped at a red light and I pushed in the clutch to put it in first gear and when I tryed to release and accelerate the clutch pedal would not return and when I pulled it up with my hand the car would not move. I am able to put it into neutral and back into first or any other gear and pull the clutch pedal up, but the car will not move when I press the gas. I was able to push it while in neutral, but it seems like the clutch is not releasing even though the pedal is pulled up. What can cause this to happen and how do I fix it?