It won’t solve everything but exercise and eating right can go a long way to ensure you’re not antagonizing what I am assuming is your clinical depression that I suspect is what you are in treatment for.
The dealing with “everything” -you could try to find what specific issues are most important to you. Find out what you can do about them locally and participate in doing that perhaps through volunteering or otherwise. -That’s what I try to do. Volunteering keeps my mind occupied and engaged in a healthier manner than doom-scrolling. It also makes me feel like I’m contributing to a solution (limited though it may be.) It’s also good to figure out and try to accept that which may be beyond your control, but I don’t want to overstep.