Keep calm
ANDEI. There are three possible explanations to your experience.
The first is that it's just your fears materialized. I think the rejection you got from the beings kinda supports this, as it's a feeling that I know from more depressed and anxious moments in my waking life, only projected onto actual human beings. Later I learned it was completely unfounded in reality.
The second is that you did commune with beings outside yourself, but they were just messing with you.
The third is that these beings actually are capable of perceiving your future or your lifespan, and were telling the truth. However, in this case, it might be possible that a "short while" for them actually means something like 85 earth years.

So no need to panic at all.
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I love your style,
Beatriz, but am not sure I agree with your conclusions.
I mean, what even is the definition of "spirit", so we could say "we don't believe in them"? I'd say that "aliens" (similar biological, tool-using beings that evolved similarly to us on a planet similar to ours) is as much a primitive hairless ape concept as "spirit". I'm convinced reality is extremely weird, and if we do set Occam's razor aside (which we already did have to do, in order to not dismiss your explanation), it's quite possible that entities we might encounter this way, if exist, then exist in a quite fundamentally different way compared to out existence...

So... "spirits", "faeries", "great old ones", call them what we will. Things fundamentally unlike, and yet hauntingly familiar to us.
Do you believe in the THIRD SUMMER OF LOVE?