Computers are dumb. They only do what you tell them to do, if they are capable of doing it. You (inadvertently) told your computer to get rid of the notes.
If you accidentally put a filet mignon into a meat grinder, you can't get the filet mignon back. And it's only two little steps!
1. Put the filet mignon in the grinder.
2. Push the 'on' button.
Just because ti was just two little steps doesn't mean that it was a minor procedure.
If you don't have backup of the data, you cannot recover the data (short of recreating all the data manually).
It is as simple as that.
Truth hurts sometimes. Put on your big girl pants and move forward, or see if there is a data recovery service out there that gets your info back. It's a huge long shot, but all you have to lose is some money that you spend on the service that may or may not (probably not) get your data back.
Take better precautions in the future.