Hello!
I can understand what you are feeling. Bipolar is very very tricky. I was diagnosed with a lot of things before they pinpointed what was wrong with me. I believe that there is no in between because its an illness that sneaks up on you. I went three years with just periods of lows and highs but was basically stable without meds till I relapsed into some deep schitzophrenic episode even though I don't suffer from that disorder. What??!! Exactly what I have been asking myself.
With this illness you feel ok some days but then there are times your mind wanders and you dwell on the past and depress yourself or then your mood goes from happy to sad in an instant.
I am in a state of perpetually feeling lost. I feel lost these days. My mood is very stable, and I just suffer from chronic boredom for something to occupy my mind. But if you are suffering from severe mood changes that could be the beginnings of it. Go to a therapist or a doctor. I suggest seeking talk therapy first because there are some doctors that will just push pills at you like one did to me. It wasn't a good experience. Talk it out with someone first and then you both can decide whether you need some type of medication.
Hope that helps.
Take care.