I was doing some work using Texmaker and my all of a sudden my keyboard stopped working and my mouse stopped working. But I know that I had just saved the file, so I restarted my computer. But now when I open up the .tex file to continue my work it is completely blank. It says that I have about 20000 characters typed, but when I try to compile it into a .pdf it says that there is nothing to compile. Is there any way that I can reverse this? Luckily I have a .pdf of my work already saved, so I haven't lost all of my work, but it will be a pain to retype all of it again. Is there perhaps a way to start a new .tex file and when I compile that into a .pdf, have it combine with the other .pdf to make one file?