DNA Proves Existence of a Designer

[Angrboda]

You believe that you had a shared experience and that the cause of that experience was what you thought it was.  As pointed out before, it could have been folie a deux, sloppy thinking, or you could indeed have had a shared experience that had a mundane cause.  Bringing up things that you think are evidence as to why you're not deluded and your beliefs are true is of no help.  Deluded people do the same thing for the subject of their delusions.  Once again, no cigar.  Try again.

And yes, all mentally ill people are different.

ETA:  Delusions aren't a typical feature of Bipolar I, unless we're simply describing things differently.  Maybe she needs a better diagnosis.  And maybe she's not deluded in the way she thinks she is.

Everena: No, no and no. We know what we experienced and you have no clue what anyone else has experienced so stop pretending that you do. 

And yes, delusions are common with Bipolar Disorder 1

My reading, as well as my experience, tells me that delusions are a feature of psychotic episodes in Bipolar I, not a regular feature of having the disorder, as in schizoaffective disorder and schizophrenia. A glance tells me that hallucinations aren't uncommon either. Perhaps the unfamiliarity is what enabled your sister to differentiate them. And I've already been through the "you have no clue what anyone else has experienced" argument before, so why don't you stop pretending that it hasn't already been dealt with. As noted before, the claim is self-refuting and even if it were true, it's not necessary for me to know what you experienced for me to infer that your conclusions about your experiences are irrational and not to be trusted. Apparently you don't learn from experience. A fact which explains many things.