Photos gone missing after deleting a few others

Hi
I have been searching the net but have not found the solution.

A couple of weeks ago my iPhone 5 told me it was full and i had to make some space before I can make new pictures. I connected my iPhone to my Windows 7 computer. Went to my computer and opened the file Brendan's iPhone and copied a bunch (not all) of the pictures to my computer. After that I deleted a lot of the old pictures from my computer. When I looked on my IPhone at the photo roll, all of the pictures where gone. The videos had a length of 0 sec and nothing to see on it.

When I open Itunes, it states that there still is 1,7gb of pictures on my phone but I cannot find them.

Last backup was months ago (icloud was full months ago as well).

Anybody have any advice to get the pictures back?

By the way I did the same with my girlfriend’s iPhone on a different computer and first copied all of the pictures so nothing would go missing. After I deleted half of the pictures the others disappeared as and the videos are damaged. I didn’t even remove the iPhone from the computer and they went missing.

Thanks!!

Brendan