A mild euphoric hypomania is always tempting, however it doesn't always stay mild and things can get out of control pretty quickly. I, too, sometimes go a while without a manic episode and think the docs were wrong, but it doesn't really matter how long ago you had an episode; what matters is that you had one and therefore fit the diagnostic bill for bp. Like Christina said, you can get a second opinion if you truly think your doc is wrong about your diagnosis.
Is there anything you can do to bring more excitement/joy into your life without triggering hypomania?