You can't just "get" adhd. You would have had symptoms your whole life, just not recognized it as such.
I would ask your pdoc why he thinks this, and discuss it with him. Does the diagnosis make sense to you? It seems pretty complicated to me, and there is a lot of comorbidity, obviously. Adderall can exacerbate anxiety, so I wouldn't think he / she would just throw you on it for now reason.