Do you believe in de-javus? If so what do they mean to you?

For the past 3 years I have had more experiences with de-javu (not sure how to spell), These experiences make me feel like I am closer to something but I don't know what that something is. Lately the few episodes or feelings that I have been here before, have been upsetting because they leave this empty and scary feeling like the outcome is bad...when I say I experience them I mean weekly basis and sometimes 2-3x a day, the most I have lasted without experiencing one is like 3 weeks. Need some enlightenment.