For folks in the education world, this is The Beginning of the School Year--a time of major effort, transition, preparations, beginnings ... sounds like a great opportunity for being overwhelmed by life, doesn't it? Even if all you have to deal with is school and the rest of your life is completely low-keyed & stable.
There are few professions that start so closely from scratch each and every year, year after year, as those in education--I suspect especially teaching and studying.
If you weren't overwhelmed with life now, I'd think you weren't paying attention. And if you weren't overwhelmed, you couldn't possibly be bipolar.

I hope you get some good sleep and a little perspective--& have a great year at school. What do you teach?

Take great care of you.

Roadie