All the pics from my digital camera have disappeared overnight???

I used my camera the other day to take a pic and all the pics were there then i put it away,and yesterday i took it out with me to take a pic and when i turned it on it said that no pics were in the camera,but there where two pics there from 2005 that i had erased ages ago, they havent been on the camera for years?so how could they suddenly appear now?and the rest of them gone??that totally pissed me off i had sooo many pics in there and no one has touched it and i have not errased any..plz help?

the camera is a Konica Minolta Dimage Z 20..

I looked up your camera. Besides using Secure Digital flash memory, it has 14.5MB internal flash storage. Is it possible you are looking at this flash storage instead of the SD card (or the other way around)? I would hope that this is the case.

Change the memory card. That card is bad. I don't think it is the camera.

go to google
type photo rescue
when you get the pictures back
buy a new card