I'm not sure I have the right answer for you. Everyone's different. For me, after a lot of soul searching & research, I've found people in similar situations to mine. Some of us are able to see the problems in our world with much greater complexity than most. We look at a world issue and see how it connects with other issues, all the people who are involved, dozens of possible resolutions & many potential outcomes for each resolution. It is emotionally taxing to see all of that at once, and yet there is really no way to see it any other way b/c of how our minds work.
We want to pick the best solution, and yet no solution is perfect, so -- much like the Rubik's cube -- we keep trying out different solutions hoping to find the one that matches. But life is not like math. There often is no "right" answer. We can keep trying to find it, but never will. It's a hard thing to accept. Very hard for me. But I need to face the reality that my best contribution to this world, the best way that I can approximate a "right" answer, would result from me choosing a path & heading down it rather than suffering through a more careful exam of a couple hundred possibilities.
There is a book that really helped me a lot. It is "Beyond Boredom & Anxiety" by Mihaly Csikszentmihalyi. There are lots of other great books out there, including some that are listed to the right under "Resources", but I recommended this book b/c it specifically deals with anxiety in high IQ individuals. It is a bit more theoretical than other books, but I think it still does a great job of outlining coping strategies both in the workplace and in the social arena. Hope you find it as helpful as I did.
best wishes with your new job & everything,