Interesting question!

Here are mine:

1. Doctor-- (I'm assuming you mean primary care physician) I will tell because a lot of times the stuff that is going on in my my head will manifest itself physically.
2. Other professionals-- I have told one of my professors because one of my depressive episodes got to the point in which it was interfering with school. I trust this professor a lot. I will normally be open about things when it gets to the point in which it interferes. Plus, I go to school for clinical psychology, so it's accepted to be honest about that sort of thing.
3. Family-- I tell my sister and husband a lot about how I feel. I don't tell my dad very much because I have this whole thing about not disappointing him. I don't really talk to my mom about it because I will end up banging my head against a brick wall.
4. Friends-- I have just started to open up with friends about this. I don't have too many friends, but the ones I do have are close. However, I do not feel comfortable going in to it with most of them. With one or two, I can talk about it.
5. Employer-- Once again, I had to be honest, as it was affecting my job. The depressive episode, combined with the side effects of a new med were causing me to come in late, and call out a couple of times. They were extremely understanding.

When I say that I tell employers/professionals-- I don't go into detail about anything. I just tell them the minimum that they would need to know if it is affecting my performance.

Oh and as far as pdoc and therapist...

I am working on telling my therapist everything. It's coming. Slowly. Very slowly.

My pdoc-- well, I try to be as open as possible with all of my symptoms, but I tend to shut down with him sometimes. My therapist helps with this, as I will ask him to update pdoc on what's going on with me so he gets a better idea of the situation.