This is the video that helped me. 

https://youtu.be/RrDWFMuXOXI

It is a very disturbing feeling thinking that you have lost access to your wallet.  I went through this last week; if you check a few pages back there are some answers to a similir question that I asked. 

Luckily I had my wallet.dat file that I had backed up two days previously.  Without that I would have had to rely on the wallet.dat file that was on my computer and possibly corrupted.