why "just" emotional problems?

I think that is a simplification how deep can emotional troubles lead. Traumas, disappointments, loses... they affect one deeply. So if you go through bad time because of them are you "ill"?

I would never say it's "just" emotional, like I wouldn't say "just" a grief, or "just" a trauma. It's sad we have to consider something illness and pull "it's biological" out of arse (since there's no definite proof) for it to be taken seriously.