That's interesting, I can't say that I have had a dream like that, I would assume if it is a feeling you can't shake then it seems very likely that either it was a past life experience or realm but as well I might say that it could be from this life time, not always due dreams give us all the info we want, If say I was mad at my best friend I might have a dream to that respect but the person might not be the same but the anger may be of a similar disagreement or why ever I would be mad at my best friend.

If you have experienced other past life memories via dreams I might be apt to conclude that but from the sound of it you are new to this sort of experience.

Either way, rationalize the feeling, Is there some one you need to apologize to? was it just a dream? past life experience? then try not to hold to heavy on it and see it as it is.

Hope my opinion was of some help to you

Kimi