It'd be a good idea to go see a professional to help assess your history and symptoms. On the lost, I hear you, been there a lot.
For your question, yes. There can be spaces in between that are pretty level, being neither manic-y nor depressed (the lost thing is a separate issue). In BP, this would be called remission. It's very often the time when people doubt their dx and think they're either "cured" or never really had it. It can last varying amounts of time, but it can be a very rude awakening when symptoms return (if, in fact, someone actually does have it). In dx'ing, history will be considered, not just where you "are" at the moment. Hope that helps!