Limp Home mode? :S

[FordFan86]

This morning, on the way to tafe, started the car went to pic the 2nd chic up to give her a lift (ended up driving off after revving it to 4k outside her house) the trans was fine on the way there and then to the main road, i accelerated to ~70k and i hear this hollow winding noise/ hard to describe, anyway i backed off and went up again, same noise, so i took it easy for a little. Noticed the revs were sitting a little high, got pulled up at a set of lights. I took off and i noticed it was very sluggish, WOT and it very slowly climbs to 3k rpm. I think oh **** whats wrong, im locked in 3rd. Change down to 1st, up to 2nd and into drive, revs stayed where they were, no gear change at all. So im thinking shit. Anyway, turn the cruise button off (normally hit on when i get in the car) thinking no point using that when i get to the 80 zone, a few seconds later i change thru the gears again, and it seems i now have drive back. On the way home from tafe... all 4 gears, pefect, if not better than ever. I'm trying to work out how and why this happened? :\
(it's the damn chic with the ****ed trans in VR calais 5 litre cauzing this i swear )
EDIT: about 2 weeks ago i said to myself may as well get my trans serviced sometime, just clicked 200,000k and then i'll know it's done... weird how this just happened today lol