My takeaway from witnessing a friends journey between imcompetent doctors, side effect heavy antidepressants and increasingly whacky other depression treatment methods:
When ADHD is the actual root cause, leaving it unacknowledged (and untreated) will achieve nothing and cause unnecessary harm.
Getting a first diagnosis took me about 10 minutes. I’m in Canada, and we have a doctor available one day a week at the office. After a 10min discussion he gave me a prescription and with some trial and error we found the right dose of concerta to use.
Lucky you... getting an appointment with a specialist (a GP wouldn't suffice) currently takes upwards of 6 months in this part of the world. And that's just for diagnosis - no prescriptions.