Dear Mari
I honestly do not believe your vision (i refuse to call it a hallucination in this case) was due to bipolar or a psychotic symptom.
When you meditate, assuming you use deep, slow breathing your brain waves will slow to a frequency typically similar to stage one sleep (alpha waves). It is possible to slow them even more. And btw, while REM dreams do have particular characteristics, we dream in ALL stages of sleep. So a "vision/dream" is entirely plausible.
Meditating, your psyche is more open ... this is part of what meditation does for you. It can go places you don't know existed... and don't expect, just like in dreams.
Listen to your tdoc. others have told me the same thing about getting a guide, especially if we have difficult territory in our subconcious, or might not have the skills to cope with it on our own. a guide would keep you "safe."
I think perhaps the only "bipolar" thing about this event is the high intensity of fear you experienced from it. And even that may
not be due to bipolar, if it is linked to an early trauma.
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as for the actual vistion it could be symbolic. (eg: Jungian interpretation might be that your male persona was becoming too strong... threatening to overpower the "whole Mari.") If you are convinced it is real, it may be linked to early trauma. If so, it is probably in your best interest to work with someone to investigate that with caution - and yes it takes courage. But if you don't, it will keep festering and retain power over you. Only when you bring it into the light can you reclaim your own power over it.
I am so sorry about these frightening experiences. It is good you've pegged down the age range when it started to happen.
(((

hugs

)))
~ waves ~
ps. once i dreamed someone was at me with a knife. They had me by the sleeve already and... i was shaken awake... by an earthquake. i still dunno what mine meant - i think earthquake was coincidence, but was relieved to be awoken by any means and i am NOT curious how that dream would have ended!

I hope your upcoming days are peaceful. i send you white light to protect you... even from your visions.