Erkka, I don't know where to begin, and I could write a reply three times as long as your post to do what I'm about to say any justice, but I'll try to be concise. Don't be so quick to dismiss your vivid memories. One day last June of 2016 I woke up and started noticing that things were different. I'm 44 years old tomorrow, and I'm saying that things I've known for 43, well, 42 years were suddenly different. The world map is different. The moon is different. The sun is different (was off-yellow and now bleach white). Music lyrics have changed. Company logos have changed. Celebrity names have changed. Human anatomy has changed. The pyramids of Giza have changed (and I've studied Egypt since I was a kid). The Bible has changed. There are literally thousands of things that have for me, changed. I'm not the only one, there are thousands, hundreds of thousands of people online pointing out the same things I've noticed and we all have the same memories/experience of a different reality that supposedly never existed. Can we all have the same and very specific false vivid memories? Confabulation? To me, they are not mere memories or beliefs but fact. I know my name and my family's names. (they haven't changed, but it's on the level of our names changing). There are certain things you just know to be fact because they were your reality not for an hour or a few moments, but DECADES. Every day of 42 years I lived under a yellow sun, every day, all day. Now it's bleach white. I know this may sound very crazy, but I know that reality has been modified. Look up the "Mandela Effect" if you have not already seen anything about it. It has deeply affected me.
The Inca said that they believed that they were living in the time of the "Fifth Sun" and that the time of the 6th was coming later. It seems that this has been going on in cycles since the beginning of civilization. The Inca did not have the internet to compare notes with others across the world. They would likely only have noticed any shifts in reality and consciousness in limited ways, IE: the sun's color/size/motion. The Maya had similar lore and the whole 2011 end of their calendar was really a shift to a new age or epoch. I'm not saying they had all the answers, I'm saying they at least were aware of a cyclical reality shifts and charted them out the best they could and built religious lore around the idea in an attempt to explain it.
This is pretty heavy stuff, and can be frightening if you experience it. It can lead one to question certain things. But know this, we did not die as some suggest, reality is not a fake simulation as some are suggesting, etc. I think this is the same Earth, the same universe, just modified in-place. I think you may have had your first little experience/awareness with this Erkka, with your memory of Litku.