Major Clutch Problem

[240SX21]

hey guys.  i posted the entire embarrasing story of what happened to me on the chat forum, so ill just write about the problem itself for this forum.  my clutch pedal is completely loose, meaning that when i push it to the ground, it doesnt come back up on its own.  i literally have to pick it back up with my foot.  and my car is undrivable because i cant shift into gears(unless i grind em) since i cant press the clutch down properly.  now, i dont if this is an accurate test or not but a couple of buddies of mine had me leave my car in 1st, while we tried to push it.  it didnt roll, so they said that my clutch was grabbing, meaning that my clutch isn't burnt out.  which i figured since this is a brand new clutch(i just got the auto-2-manual swap done about a month ago).  its also weird cuz normally im told you can feel your clutch going days/weeks in advance before it actually gives out.  but this happened all of a sudden(in a matter of seconds).  the only thing i noticed was that my clutch pedal would squeak whenever i pushed it down, & this started a few days ago, but i assumed i just needed some wd-40 on the pedal.  so anyway, now my car is completely undrivable for the first time since ive had it(over a year ago).   i dont that much about manual trannys & clutches, so if anyone can help me out on what they think the problem is, that would be great.  im bringing it to my mechanic(the same one who did the swap for me) tomorrow, but i just wanted to see what you guys had to say first.  oh, and people tell me that this could be a problem too: my clutch cable is sitting really low to the ground beneath my car.  some tell me that it should be bolted to the chassis or else it could become loose & thats what might be causing my problem.  please if anyone has any ideas just let me know!!!!  thanks!!!