My Gallery is empty all my pics and video just disappeared on my Samsung Galaxy S5, how do I get these back all my work is on there?

    My samsung galaxy s5 phone battery went dead today, when I plugged it back in I checked my gallery and it is blank? All my pics and video for work is gone. Please help, how do I retrieve this, and why did this happen. I've had my phone for 3 months with no problems.

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