Thanks for making me think about this topic. I can say I've only really been depressed once in my life - after my father died when I was 17. It lasted about a year and was a bad time. But I will say, from what I remember - I felt very detached from the world. Like no one else got it and saw things the way they really are. I wasn't crying like you say you were but I was definitely very morose and did some self-destructive and risky things during that time. I was never medicated or even counseled. Just stuck it out long enough that enough things around me returned to normal or overwhelmed my depression that it was easier to just continue with life than dwell in my pit of self-pity and such.
But I do get the feeling out of touch with how other people are living their lives oblivious to how wretched, hopeless, or just plain depressing everything seemed to me.
Specifically about the environment - I feel your pain. But I realize, like grief that any overwhelming emotion about it is one of those things that is really beyond your control. Your mind and hormones muck with you and amplify things to ridiculous levels that it can feel unbearable right? But those feelings don't really help you - it's just something you need to suffer and hopefully the go away. Perhaps with your sensitivity to the state of the environment it's extra difficult - there's constant reminders everywhere and things seem to get worse every week if not every day.
Have you ever tried to participate in some activities that are pro-environment? Doing cleanups, planting activities, trail rehab - it can be tremendously rewarding to see the change a small team of volunteers can make. Just to know in the back of your head that when you see stuff messed up, it is possible to clean up and make amends. Or maybe if you don't want to deal with the mess at all in the first place - try some plain getting out in some areas of unspoiled nature. I was recently on a high altitude 3 day far from civilization, people, and lights. Just a few good friends, our tents, and oodles of mother nature. Amazing views of the milky way, asteroid shower, snow, lakes, fish, flowers, and tons of fresh air (even if we did initially have to change our hiking location due to a lightning-caused fire elsewhere).
yes, I have, many times, and I still do participate in activities pro- environment. And I also go to places with unspoiled nature, and you are right, it does help sometimes, sadly not every time. thanks for asking