How thorough were they about testing you (in case you can get a second opinion)? Did they (or you) ask your parents about your behaviour as a child? Unfortunately, according to Dr. Russell Barkley (a leading researcher in the US whose talks are available under UCTV on Youtube), those with AD/HD are notoriously bad at noticing their own symptoms.

As I await an opportunity to be evaluated myself (I hesitated to answer you earlier because I'm not diagnosed!), I've asked my parents about my behaviour in childhood. My mother had two examples and my father had another of how hyper I apparently was before the cut off for symptoms appearing. I knew I was a "tomboy" but those answers were surprising. This is despite me not telling my mother yet about my suspicions about myself, and my father insisting all the while that I was normal. Did your doctor or anyone screen for conditions like hypothyroidism or iron deficiency (and do note this interesting argument that all adult ferritin levels should be in the same range currently listed for men regardless of sex and not as low for as is typically listed for women)?

Outside of that, a nutritious diet and adequate exercise can help. In my own case I don't have as much trouble with listening to people talk as I do keeping things in short term memory and sticking to tasks that I start, so the solutions I've been seeking are for those types of issues. (I don't have much but I'm happy to share those if you want.)