Do I have hair loss from seborrheic dermatitis?

It’s unlikely with the information provided that seborrheic dermatitis is the main cause of hair loss. It’s possible it’s not helping but it’s probably not the main cause. Seborrheic dermatitis usually doesn’t cause all that much in the way of hair loss. Of course, it can if it’s severe but still it would not account for all the loss you describe. In order to tell you what diagnosis you have, I would need to 1) know all your medical information from birth until now, 2) examine your scalp up close with trichoscopy and review all your blood tests from the recent few years. If you want to know what’s causing your hair loss, see and expert. And consider a biopsy if you’re still not sure. With this information provided, androgenetic alopecia needs to be confidently ruled in or ruled out.