Ford Focus 1.8 TDDI was popping out of 5th gear now won't go into any gear! Is it Clutch or Gearbox?

The car which is a 2002 was jumping out of 5th gear into neutral when travelling at 60mph. Now it won't go into any gear and I can only start the car with the clutch pedal pressed in and when I release the clutch pedal with the gear stick in neutral the car stalls. The gear stick will literally not go into any gear. I think I need to find a used gearbox and I think the clutch is fine. What do you think?

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