there is a line in a book i read that haunts me - i think is relevant here - "What if everything I believed was false?" that is the two-edged sword - not knowing can be terrible - but knowing can sometimes be worse. and you don't know which it is - until you know. and then it is either a big relief - or too late not to go there. how will you ever prove or disprove it? memories are not always accurate. and it doesn't sound as if there are any objective observers who can tell you. if you can, try not to pick the scab off that wound. if it becomes clear, then deal with it. if it doesn't, i'd say, try to leave it alone. i know - easier said than done.
feeling for you,
"My experience has shown me that I all too often tend to deny that which lies behind, but as I still believe, that which is denied cannot be healed." Brennan Manning, "All is Grace - A Ragamuffin Memoir"