fuckin car

giving it some beans in 4th, changed up to 5th then i seem to recall it jolting a couple of times, then I bogged down so dropped it to 4th and carried on.

LOADS of rattling, and clonking; then realised 5th gear had gone..... if you put it in 5th it just revs - no drive.

Then when I got home went to reverse into the drive and can't get it in reverse - gearstick physically won't go in.

any ideas whats happened? selector or gear or what?