:gopray2::gopray2: for you and your family.
My father has bipolar disorder, as does one of my sisters, and my other sister and I have dealt with various mental health issues as well.
After one of the most recent episodes, I talked with my mom about how she had dealt with Dad's two hospitalizations ~20yrs ago and the more recent problems. She said that it wasn't until after my sister's first hospitalization that she realized how depressed she had been for several years while dealing with Dad. She was distant from us girls, unable to connect. We didnt' know what was up with her, but we felt the difference (we were 1-4, 4-7, & 8-11 at the time). The doctors my sister saw spent more time with the family, and Mom got on anti-depressants for a short while, which helped her greatly. She really regrets not asking for more help earlier.
Please think about talking to a doctor about anti-depressants and other self-care (like nutrition, exercise, support groups) for yourself. Even if after talking with your doctor you decide not to right now, you will have opened up the topic for discussion and can touch base later. It's also helpful to have someone you can talk to openly about it--to express what you feel (whether anger, pain, confusion, sadness, ...) so you can have emotional support. This could be a therapist, a priest, or a close friend.
Also, if you haven't already, check out a local book store for a book about dealing with bipolar. Some are written more for the person, with some info for families, and others more for families. More recent is better, and look for ones which include discussions of medications (the ones which claim only "natural" remedies work are mostly crocks--herbs & nutritional supplements can be useful additions to therapy, but can't replace modern medicine).
Again, many prayers for your family.