My phone did this until I freed up some memory. Go to your pictures folder and in options put the reserved pictures memory to the lowest.
It could also be that you have it set to erace them every hour or so. Go to your message folder, then to options>General options and make sure you choose forever on the keep messages tab.
You can also hold down the bottom left key when at the main screen and push l g l g, then click menu key when it pops up, Options>scroll down to a ticker box, then click menu key again and hide all types.
Life is like a movie, you've sat through half of it and its sucked so far, it probably isn't gonna get great right at the end to make it all worthwhile. you shouldn't get blamed for walking out early