95 cav - clutch problem

i have a 95 cav and am having a clutch problem. i can only shift into first gear, everytime i try to go into 2nd it makes a grinding noise and does not allow me to switch gears and the clutch pedal sticks to the floor. at first my fluid was low so i added more, then it drove ok for a day and the next thing i know the clutch is all the way down to the floor and im stuck in neutral. i was able to get it into first gear and get home but i have no idea what the problem is. any help on what it might be will be GREATLY APPRECIATED!!!