I delayed seeking help because
I was worried about the stigma and
because I thought that it would just go away.

It never did.

Bipolar Disorder is not an illness which goes away of its own accord but one which often needs long-term treatment. If you have experienced an episode of mania or hypomania, it's best to seek professional help as soon as possible. It may indicate that you have Bipolar Disorder, which, if left untreated, will likely involve further episodes.