It sounds like your feelings are very natural responses to what is going on your life right now. Keep in mind that every dip, every depression, is not necessarily Bipolar-related, and therefore as well, perhaps changes in medication might not be warranted. Though only your pdoc could help you make that decision.

I would give therapy a good chance and has been said, delve deep into your tool box of coping mechanisms. Perhaps you can plan some sort of vacation, perhaps just a weekend out of town, even if it's not until the relatively far future, so that you have something to look forward to.

It sounds like you're going through a very very challenging time. I hope you feel better soon.