Are you actually three agents?

you can unimagine all of them. Dictate them out of your head.

I am not actually three agents, any more than you are actually one (or six, or whatever). However, modeling my behavior is much simpler from a three-agent perspective than a two- or a nine- agent perspective, so it's a useful tool. I can stop using that model, but that won't make my aberrant behavior disappear.

Edit to clarify: I was behaving this way, (but much worse) years before it occurred to me that thinking of myself this way might help me understand and remedy my behavior. Your post seems to imply that I could fix the problem by unimagining these agents. If that's what you mean, I'm a bit insulted, but you might mean something else.

Have you tried any other treatment for depression as depression, not as bipolar disorder

I was originally treated for depression, not bipolar, because my hypomanic states aren't manic, and weren't originally noticed as contraindications for certain standard treatments. This is very common for type II bipolar.

Regardless, non-pharmacological treatments for depression have helped me, and continue to help me more than the subject of my post---they're just less relevant to the Less Wrong community. Cognitive behavioral therapy has helped a little, but my most successful treatments have been habitual and environmental changes. Notably, regular early morning sun exposure, omega-3 fatty acid supplements, more sex and more frequent exercise.

Mood stabilizers also work, but at the cost of my mind, so I don't take them any more. I'm lucky that my disease is mild enough that it can be controlled with the methods above. There are plenty of people who simply have no choice other than their mind or their life.