Past Lifes?

Since I was a very young child I have known that in a past life I was in a concentration camp somewhere in Germany. I know that back then my family was executed because my mother refused to have an affair with a German man and he d her to which my father retaliated resulting in his death and hers. I later died of either ill-nutrition or something like that. I have talked to my family about this and they think that I am absolutely crazy but I know that it happened because I dream about it almost two or three times a month. In the dream I see a tattoo on my mothers left arm with the numbers 84705. Is there any way that I could search for a history of this number? Has anyone ever had an experience similar to this one?