My breaks usually gave me enough time to consume a single banana, drink a little water, and use the bathroom, all with an entire minute left after I sat back down (after all the body scans and fingerprinting to get back inside the test room). What helped for me was that the exam proctors were friendly and easy to talk to, helped keep my mind a bit relaxed. As for when I get back into my seat, I usually focus on breathing slowly for about 5-6 breaths (40 seconds). Clears your mind.
Warning: This method worked so well that I completely forgot what passages were in the VR section after the exam, and I still can't recall any of them. Use with caution.