I have had situational depression that wasn't "part" of my Bipolar... but in a few cases eventually it all blended together and just became an episode that I had to claw my way out of.
Being human and having a range of emotions is normal..... People seem to forget that having Bipolar doesn't mean you wont feel the normal ups and downs of life.
You mention Rapid cycling.. So your having 4 or more distinct cycles in a 12 month period?
I am currently dealing with a ton of situational stuff.. Psych meds are not going to help me deal with it all, Hense why I am still med free, even coming off a week IP stay... I have to process it in Therapy and move forward.
I hope your able to find some peace