Hair falling Out in mirror While sister Ignores

"So I'm in front of the bathroom mirror, just doing my normal thing, and I run the brush through and a chunk comes out. Not like a few strands. A chunk. Like a whole patch sitting in the bristles. And I stare at it for a second and then I'm like "okay that's normal, people shed, it's fine" and I keep brushing. Another chunk. Bigger this time. And I can see my scalp starting to show, this pale spot near my part that I've never seen before in my life. And I'm just staring at it and my hand is shaking a little and I look down and the sink is full. Full of my hair. Like I emptied a whole pillow in there. The weird part is I didn't stop. I kept brushing. And more came out and I kept going and in the dream I'm thinking "maybe it's just the brush" so I switch brushes and same thing and I switch to a comb and then just my fingers and it's coming out in fistfuls now, like pulling weeds, and I can't stop, like it's compulsive, and my reflection is changing. My face is the same but the hair is thinning and thinning and I'm watching myself go bald in real time. My sister walked in. Just walked right in like it was nothing, and she's talking about her weekend plans, and I'm standing there with my hands full of hair going "look, look at this" and she just glanced and went "you always do that in the shower, it's normal" and walked out. And I looked in the sink again and the hair was gone. Just gone. Sink's empty. Clean. I checked my head. All there. Ran my fingers through, nothing came out, just normal hair, but I stood there for a minute pulling gently on strands just to test them. All secure. Didn't believe it though. Spent the whole morning paranoid, kept checking my pillow, my shoulders, the shower drain. Nothing. Nothing all day. But I'm still not fully convinced."