From experience it sounds like depression. I know when I get into the depression phase of my bipolar my self confidence, interest in life and hope of any future all take a huge dive. Ive had bipolar 14 years diagnosed and love the highs...and want them to stay forever. Experiencing them makes the depression so much more debilitating, for I know what I am capable of both feeling and doing.
I would be recommending you go back to your support team/doc /therapist and tell them how your feeling and where your at. Take care its not always going to feel like this....hugs[emoji6]

(Bipolar Lamotrigine 100mg, saphris 10mg, valium 5mg)