I cant say whats what in your location but if I had wrote what you did and printed it off and given it to my treatment providers they would tell me that what I was perceiving as false memories is called having delusions and hallucinations.

the reason my treatment providers would call it hallucinations and delusions in me is because the definition of this is having thoughts and images that come from no where that can not possibly be real.

a memory even false memory has a realness behind it either the emotion that the memory is real or a treatment provider or other person has coached that person into thinking something happened when it didnt or the person is purposely making up stories and fake memories to impress someone or they have a mental disorder called... fictitious disorder imposed on self.

my suggestion is since these memories can not possibly be real for you in any way and are coming to you out of the blue to contact a treatment provider (doctor, therapist, psychiatrist) that can diagnose this problem and get you treated for it.

unfortunately we can not tell you what this is with in you, only what this is with in our selves. in me it would be called psychosis (having hallucinations, having delusional thoughts)