Whenever I take a break, I lose track of what my plan was and I get totally lost in shallow activities. How can I deal with this?

Taking a brake is not the issue. Taking a break sometimes helps our minds work out the small details that are wearing us down. However resting is not resting wif you are using your break time for things that distract you. Taking a break to close your eyes and breath may give you the rest you needed while watching a tv series may just get you more overwhelmed and distracted. This time try to take a break by simply switching positions. That could be sitting to standing. Maybe taking an uninterrupted walk. Or just doing some breathing exercises.