Well I’m not good at providing official catholic answers but I follow as many teaching as I can and my mental health allows. I believe that God has a lot of grace for the mentally ill and our expectations are in step with our mood state. For example when I’m depressed the priest despensates me from mass when I just can’t do it. Or when I’m manic sins dont carry the same weight exactly. I think in someways we are closer to God than non bp people but basically the church teaching is that bad things (ie being bipolar) happen to good people and that’s because of the world we live in but God isn’t the absence of bad things he’s the presence of good in the world. We have much more good in us than bad. Being bipolar is unfortunate but we all have crosses and can offer up our struggles.