OK, there are two possibilities we are dealing with here and they are:
A. That you are telling us the truth as you see it.
B. That you are joking around with us.
Let use assume -
A were the proper answer.
Then we have it split into two more:
A. That you are completely crazy.
B. That you are doing quantum time travel.
Let us assume -
B is correct in this case.
Well, I have done quantum and you have two sets of memories.
In fact, you remember your past life as if it were a dream that is a bit faded, but you can still access.
Problem is that you claim you do not have all the memories. In fact, that is rare.
Typically, it is your original life that is hard to remember for you.
Think of an UFO abductee, of which I know many. They have fragmentary memories. Also experience having time missing. People claim they just imagine it. Well, they have scars. However, they also have a memory gap.
Hypnosis is used to fill in gaps. Often the human mind will block out unpleasant memories. Perhaps, hypnosis is a tool you can use. The mysteries of the human mind are many.