I feel the same way, and I've found that action was the best treatment to help with my anxiety. I also likely have an anxiety disorder, so SSRIs helped with anxiety in general, but I was acting far before medication and found it's far better at dealing with specific worries.
I've done some of the usual stuff (CFLs/LEDs, more insulation, mostly hybrid/FE cars and biking when I can, minimize meat consumption, buy used/re-use/recycle), and I'm looking forward to some more usual and unusual improvements. I helped my mom buy an earth-bermed block/stick home, and it's been pretty nice. Cooler than normal in the summer and warmer in the winter. We're planning on putting in solar panels, a solar thermal/GSHP system, getting/building EVs, raising hens for eggs, grey-water recycling, maybe hydroponics per MMM's recent post, etc...