I have flat affect and flat vocal tone 99% of the time, which means most people cannot tell how I feel unless I tell them. My facial expression legitimately does NOT change and my tone of voice shows no excitement, sadness, anger, etc.. Just zero inflection.

When manic, I will actually start smiling, talking rapidly/tangentially, and joking a lot, so those symptoms are a dead giveaway. My bosses in the past have noted my extroverted behavior, because it is so unlike me. But still, my tone of voice does not change.

My depressions don't show because I am good at hiding my sadness/apathy. (I am just so used to hiding it because I have been doing that all my life.) However, many people often mistake my flat affect for depression or disinterest in things. (e.g., my boss and coworkers sometimes think I hate my job. lol.)

Finally, when I am psychotic, no one really knows it. I keep my hallucinations and delusions to myself (except in front of my therapist). I just know from experience that people twist my words, stab me in the back, etc., so I tell them nothing regardless of mood. I know they won't care or will use it against me, so I say, "f*** them."