She may also mean its really hard to watch you go through all of this. She may also be hesitant to share this with you out of concern for how it could affect you in your current state.

I develop hypomania from time to time, and like you, don't really do anything "off the wall" except sleep less, talk fast, and get irritable. My wife ends up in the crossfire at times so I ask her how she's feeling, how this is impacting her, is there anything I can do to make this easier for her until the mood stabilizer kicks in, etc?

I would recommend just thanking her for her support, telling her you know it must be really difficult for her, and tell her she can be honest with you and that if there is anything bothering her, she can feel free to share with you and that you will do your best to take care of yourself and will do whatever you can to make all this easier on her.

Thats what I do with my wife and she has said she really appreciates it (in between getting frustrated and asking me "Why can't you just *be normal*?"). This disease is really hard on our loved ones too, but they know we're suffering, so any effort we make to help them is usually very appreciated.

I hope this helps. Let us know how things turn out!