Restore annotations mind map

Hi, guys. I was studying and I was creating my mind map using excerpts from different documents. I mistakenly deleted one of those (but I kept the annotations) and the annotations (from the document I deleted) I had on the mind map disappeared. Is there any way to restore the annotations? I’ve tried to re-import the document I deleted but nothing happened. I wonder if there’s any way to cut corners. Redoing everything would be a huge hassle. Please, save me. Thanks in advance