One thing I have found that helps me feel more in control when I get too many things trying to drag me down is make a plan. Make a list of the things that need doing or that are bugging you, then make a plan to deal with each of them in order of priority. Then do your best to stick to that plan and use it as needed to beg out of other things to stay on task. If you get too far off plan, reset the list, reprioritize, replan, then move forward. Sometimes just having a plan for how to deal with it all can make it seem more tolerable and less overwhelming.