Hello Vera,
We're sorry for the trouble you had, try opening the files saved in the auto-save in Adobe Reader and see if this brings the sticky notes/comments in the PDFs you made.
Right Click on the file and choose Open With>Adobe Reader. If Adobe Reader-created a backup copy, which it will do if the option under Edit>Preferences>Documents>Automatically save documents changes is enabled. If it is, then the temp files should be under the AutoSave folder of Acrobat, which is: C:\Users\<Username>\AppData\Roaming\Adobe\Acrobat\DC\AutoSave.
If there are no files, then there are no options to recover the sticky notes/comments.
Let us know how it goes and share your observation.
Thanks,
Anand Sri.