SD card issue

Hi. I'm new to the smartphone world & trying to figure out what the heck happened to all my pics & music that were on my SD card. I did not remove the card. It was all there a minute ago, now gone... some of my apps aren't working now either.(Google search, games) I just don't know what to do. I made no changes to the phone whatsoever. Please help!!!!! DI 2.2

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