@vistamar,
We all give up our time to help and mean it.
I'm confused because I don't understand what "notes" you are referring to. Do you mean the OS X "Notes" app within which you can create notes and sync them between devices? Or do you mean you created notes yourself in Word or Pages or Text Edit? By telling us this, we can help you retrieve them if this is possible.
And it would be useful to learn if you wrote the notes whilst running Mavericks and then lost them after upgrading to Yosemite. You see, you know what you did, and how, and when, and under what conditions. We're floundering a bit, being in the dark. Help us, we'll do our best to help you.
Ian