Do not listen to the denier. I did for more years than I like to think about. Lost a few friends from being an arrogant jackass from time to time. Lost a lot of sleep because most sleep aids don't work well when the insomnia is hypomanic. Spent a lot of time depressed because I would give up on anti depressants or think I just had situational depression that worked itself out.
I am not sure if my social awkwardness is a separate or intertwined issue, but had I been willing to admit I had a MI, I almost certainly would have sought help for that as well.