Burgundy, there is no more shame in being depressed than being anxious (or having diabetes or any illness).

I admire the way you do what you have to whatever you feel about it and I'm sure your psychiatrist (and therapist) would respect you for it too. It's easier for them tho give the right care if they have the full picture, and they probably got more from your body language than you think.

I so relate to the way you describe your mood changing. I find human contact really helps me too.

I have longstanding depression, having lived with the black dog for my entire adult life and much of my teenage years. The last two years I'm lower than for many years before and now, when I feel better, I'm scared that it will go away and leave me back in the pit. I have to work hard to try and avoid predicting the slide, and try to make the most of any moment of respite.
There is no garantee that your positive mood is temporary, it could last longer.

I hope you feel able to be open with your psychiatrist, I suspect you will find more compassion than you give yourself, and with a better picture of your situation, she can target any treatment to what you need more easily.
Would you be ashamed if you had arthritis? That's a long term condition that affects your life too, the only difference is that it's visible from the outside.