When in gear, the gearbox whines until I put the clutch down. Also, the gear stick has a bit of play and sometimes I can put the gearstick into a position where the gearbox doesn't whine. But, normally when I put the car into gear and lift up the clutch the gearbox begins to whine.

The car is also a bit jerky when going on/off the throttle.

Is it possible that I will soon need a new gearbox or anything? Or am I just being paranoid?