I don't think lack of decision making is a specific symptom of Bipolar, but maybe a roll-on effect. What you wrote really resonates with me because I think that the low-functioning that Bipolar brings (including the huge mood swings and the differential between the productive Hypomania states and the crushing depression - which is really hard to balance and produce a productive life). Maybe psych meds affect our cognitive abilities too, well of course they do, to whatever extent. We get muddled and confused and thus decision making is difficult.
I used to be a High Income PR
/Communications Manager for many years. The progress of my illnesses and also the terrible mis-prescriptions by a series of psychiatrists has meant I have lost my career (and my house), which like you was very creative and satisfying. I tried to go back to my career this year with the help of an excellent mental health team and job agency. But I have blown a cognitive fuse and I had to resign from the job. Devastating. I am now on the Disability Suppport Pension (Aus) which is under the Poverty Line. Sucks. At least we have a Pension and for that I am grateful.