Myaccount, I am more or less in the same boat as you are, its just that on top of that I have used some medicine that I probably should have not, so I am not sure whether my sudden hair loss was attributed to the medicine, or to 4 weeks of continuous insane stress, and I dont mean stress like work-related stress, cant chose my holiday-stress, cant find a girlfriend/boyfriend-stress, I was severely stressed which resulted me getting really bad anxiety/panic attacks and depression, just starting to recover now a bit. You can see my horror story here:
https://www.hairlosstalk.com/intera...ia-lost-my-hair-in-a-month-devastated.119051/
Anyway, I lost A TON of hair, mainly crown and top where I usually thin (I also had 2 FUE transplants in that region). So from a head full of hair I went down almost looking worse than before my FUE hair transplant in just a few weeks. I also shed quite a lot of eyebrows, everytime I would go through with my fingers I would have 2-3 on my fingers. That subsided now luckily, but I still do shed hair...
I can also relate to you as I went to a dermatologist, and he said its male pattern baldness, as it follows a pattern (it really does), but then I asked him how can it be male pattern baldness when I showed him my pics from 2 weeks earlier where I had a full head of hair. He got confused, gave me Finasteride, and didnt order any additional tests. I am on Finasteride now, but I have booked another derma for next month, and I will insist that she runs all the tests for potential deficiencies and hormones (as I think this whole mess I got myself into with the medication and stress might have messed up my hormones big time, as I noticed a big increase in body and facial hair at the same time).
To sum up, good luck, and let us know how it went!