Every new major event in life, like being diagnosed with disease and trying to treat it, causes stress and rises many questions about how will all this go.
First, you shouldn't expect abrupt switching to "new" you.
It takes time to find the right combination and doses of drugs that'll work for you.
It takes will and energy to attend psychotherapy and psychoeducation, to learn how to live with this long-life disease.
The treatment is indicated just to control the disease, not to eradicate it.
So, you'll get less frequently and less severe symptoms of both, depression and mania or hypomania.
Definitely, you want lose you creative energy.
Imagine still having the energy for new ideas, but, also energy to accomplish them.
I guess that's every bipolar person goal.
Best wishes!