Hello peanut,
Welcome to the board. You have come to the right place to ask questions of those who are walking in your shoes. I'm sure many will chime in with comments and suggestions.
I am sorry for all that you and your husband are going through. Obviously there is a big effect on the family, especially when any children are involved. I personally feel the best way to deal with bipolar disorder is to learn as much as you can about it and the medications that are commonly used to treat it. This is important so that you can work as a partner with your husband and with the pdoc. It is an irony of the disorder that it affects the very part of the brain that would allow the individual to realize there is a "problem." So it is very common that the individual does not realize s/he has anything unusual going on. If anything, everyone else on earth is wrong and the individual is "right."
If you are interested in learning more about how to manage this disorder, I would suggest you look into ****. This is a national organization that has state and local chapters all over the US. They provide educational programs, support groups for a whole variety of mental illnesses and disorders for all different age groups, and are a wonderful resource for information and referrals. You can search for them on the internet; on their site is a link to "Find Support" which when clicked, will take you to a map where you can then click on your state to see all the various chapters located within your state. Even the website contains a great deal of information. There is one program called "Family to Family" that I particularly recommend.
Would you mind explaining why your husband stopped taking abilify? From your brief description of your husband's situation, I would wonder why he is currently not on a mood stabilizer. Seroquel is a good drug added on to a mood stabilizer, but in and of itself isn't usually used as the main mood stabilizer. But obviously I'm not a pdoc...different pdocs try lots of different ways to try to control the episodes of BP.
I would be very concerned about the psychotic aspects of your husband's
disorder. That makes it a bit different from the more common types of bipolarity. You are right in that it is impossible to predict the course his disorder will take. Ideally he can be stabilized so that the episodes of mania and depression will occur infrequently, if at all and that the symptoms of the episodes will be controlled. In many individuals who carefully follow their pdoc's treatment plans and take their meds as prescribed, bipolar disorder can be managed and the individual can lead a "normal" life. They become aware of what their triggers are and learn to watch for them and what actions to take when they feel an episode coming on.
You asked many good questions in your post. I will try to answer some of them in future posts as I am pressed for time right now...but I wanted to welcome you and encourage you to post often with your comments and questions. Also you might scan the titles to other posts to see if reading through some of them might provide some insight.

Tsohl