I have the EXACT same thing happening to me right now (see my intro post from a few weeks ago). I'm 24 years old
I started shedding heavy, for the FIRST time, in June/July, or so. When my hair is wet, I can see some of my scalp in areas where hair is brushed away. When my hair is dry, you can't really see any of my scalp, except for through my RECEDED hairline when I pull my bangs back (only for the first 1/4th inch or so though).
Recently, I have also had really bad acne. I had bad acne from age 14-19, or so. Then it stopped cold turkey until now. Furthermore, I feel like my package has gotten bigger - bizarre right? It's like I'm going through a second puberty, except now hairloss is part of the gig.
Anyways, like you, I started getting really sketched out, as my hair has always been a part of my "identity", since it was dark, thick, and lush my entire life. I set up a dermatology appointment (still ~month away), but saw an MD in the mean time. He didn't say I have MPB, but said my hair was thinned out a bit on top(relative to back and sides), and started me on 2% keto shampoo, twice a week.
I've been doing 2% keto for almost 2 weeks now. Also, I started putting a Vit E/castor oil complex on my scalp twice a week or so, before bed. I also started a biotin, fish oil, multi vitamin per day regime ~3 weeks ago. I try to massage my scalp every night before bed to promote circulation and stress reduction. And, I do whatever else I can to reduce my stress.
Questions for you:
-Did your dad, his brothers, his dad lose their hair?
-Did your mom's brothers, dad lose their hair?
-Have you recently been under a lot of stress (physically, mentally)?
-Is your head itchy?
Let us know what happens with your MD! It's fair that I am explicit that I am not a doctor or person with appropriate accreditation to insist you do certain things. I do feel like I might be your peer hair-loss wise, however.
Good luck man.