Car jolting when changing gear?

My ford 2004 failed mot this week, I paid a lot of money to have fixed yesterday I had both springs replaced and a lot done.
I had a new clutch fitted in feb this year I told them my car makes a rattling noise when my foot is off clutch and when pushed down the clutch the sound goes I can't hear this sound when driving only when in nuteral. I drove my car home fine and last night my car started jolting when changing into any gear, it's jumps for about 10 seconds and feels like it going to stall after changing gear. I was told last week that my gear box is going. Can someone tell me what I need done

Hi old cars have issues like this it has to be put down to wear and age.