I read/avoid social contact during breaks since most of the time as I work closely with people. It helps me calm down and relax. But I'm stuck out of my comfort zone so much that I do break down after a while. If I'm going somewhere I take my DSLR as well as my kindle (free 3g), and my tablet, along with my phone/chargers. Thats at least how I cope - I find comfort in the familiarity of my phone/computer setup but it helps that technology/photography/information are my special interests. I try my best not to get riled up or upset or my adrenaline surges and at that point I lack credibility or reason. In cases where I've lost control I hide my face the best I can and avoid contact because communicating will make me break down into crying.
But I find when I start to feel that meltdown feeling I avoid as much contact as possible/try to read or do something to distract my focus. The main thing I do is detail oriented activity's and quietness (using earplugs), and decreasing other sensory input where possible.