I have been diagnosed bipolar but I'm starting to wonder if I have ADHD!

Bipolar isn't so much about quick ups and downs and being triggered by things into high and low moods. The moods just sort of happen trigger or not, and they tend to last for a longer period of time, like days, weeks, months, or in the case of some pesky depressions, unfortunately, years. I'm coming out of a 9 month depression right now and it's been low low low for 9 months straight. No quick ups and downs.

There's such a thing as rapid cycling, which I think is still defined as having 4 or more cycles per year. But that's still not all that quick.

There's also some people who claim there is ultra rapid cycling where you do have ups and downs that do happen within a day or a half a day or so, but with that you tend to have massive changes in energy and a lot of other symptom changes as well besides just emotional highs and lows. So I wouldn't get too worried right away about being bipolar, but if you want to be sure, run the idea by your psychiatrist or your doctor and they can evaluate you.