A person with BP doesn't necessarily need to be on anti-d's and without a mood stabilizer it can really be recipe for disaster (this is how I was diagnosed). I don' think my mood stabilizer (lamictal) or anti-d (wellbutrinxl) have affected my glucose level at all.

For a person with BPII the hypomanic episodes can be quite mild and not that noticeable. In my case prior to being diagnosed I thought the hypomania was me just being highly driven and then when I was depressed I assumed I was burnt out.

It may even be something as simple as a reaction to stress. I would suggest speaking to a Psychiatrist. You may even want to track your mood. I use this one online: http://www.medhelp.org/land/mood-tracker