I don't think you're ever going to get answers to your question Melissa
happen to know for a fact (after having completed about 8 standard psychological tests pages and pages actually of some pretty weird questions) that
even admitting a belief in aliens, abduction, or a belief that one can do something most cannot - does not deem one to be insane.
There are psychological standards that dictate and it's normally a combination of trigger questions that lead a psychologist/psychiatrist to deliver
a certain diagnosis(s').
I am sane after all the tests (which are numerically scored). I was diagnosed with Panic and anxiety with agoraphobia, dysthemia, sloughs of
phobias...
But sane. What sanity is exactly I honestly don't know

Being esoteric, spiritual or down right flaky doesn't seem to make a person nuts.
I have had missing time also, though not as dramatic as yours. I was vacuuming and put the nozzle down to move something - the vacuum was left running
as I did this (standing in my living room) next thing I know I'm in my kitchen wondering when the hell i got there when I was about to move a piece
of furniture. That and the time that elapsed has never been solved for me.
Insanity I think is categorized not so much by what one believes, rather by how what they believe impacts their life negatively. Does ones beliefs
interfere with the normal day day to routine, does it negatively impact on loved ones and family, does it prevent one from being gainful or prevent
one from mingling in "normal" societal manners.
I'm not sure of the psychological / psychiatric model(s) of insanity, but I think it's primarily measure by negative impact of a "condition or
conditions" compared to an average model or model of sanity.
Personally I think most people are functionally insane. Just normal enough to get by.
An abductee being called insane is really just a poorly planned attack by one with differing views. however without knowing a person quite
well...proving or disproving sanity is impossible. So it's a quick and easy way to belittle someone basically.
I dare say the majority of abductees or experiencers are not out barking at light standards, wearing tinfoil beanies, or building mountains in mashed
potatoes.
Most of us have to work, pay bills, and try to eek out a relatively good life. Same as anyone.