It could be either or both.

We cannot tell.

Significant depression and anxiety can cause the organizational and concentration difficulties you have had.

One thing ADHD or ADD is pretty much a life long, continuous disorder, whereas depression and anxiety tend to generally be more episodic.

You could ask your doctor if you could try some inbetween meds, which sort of treat both depression/ anxiety AND ADD.

Some people require a somewhat experimental approach to medication, if orthodox strategies fail. Having said that NEVER ignore the social and other issues in your life that effect how you feel about yourself.

Bye