More miserable moaning...

I've lost my Oyster card. It had £20 pre-pay on it. I definitely had it yesterday morning as I remember attempting to use it but the scanner on the bus wasn't working. I didn't use it on the way home as I bought a Travelcard to get the train and the tram to Ikea. Now I can't find it anywhere. I've also failed to keep a note of the number and I can't remember where I was living when I registered the sodding thing. Aaarrrggghhh!