Heat increases blood flow to cramping muscles and can be a strong, relaxing pain reliever. If you have access to a microwave, in a work break room for example, dampen some paper towels and heat them in 30-second increments in the microwave until they are warm but not steaming. Take them to the bathroom and apply to your lower back for some soothing pain relief. If you don't want to risk making your clothes damp, it may be helpful to sit on the toilet. This way you can apply the heated paper towels to your lower back with your pants or skirt lowered. If you don't have access to a microwave, you can still employ heat to soothe your cramps. Run some paper towels under hot water in the bathroom. Wring them well and place on your abdomen or lower back to soothe your cramping. Exercise produces endorphins, which are your body's natural pain relievers. Since you likely can't put in a treadmill session on the go, try to incorporate easy exercise into your work or school day to boost your endorphins and provide some natural cramping relief. You could take the stairs instead of the elevator or walk outside during a free period. Caffeine constricts blood vessels and can increase muscle cramps. Steer clear of high-caffeine beverages if you're experiencing menstrual pain. The soothing warmth of a decaf herbal tea is a better alternative to aid hydration and relieve discomfort.
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One-sentence summary -- Create a makeshift heat pad using paper towels. Take the stairs or walk the hall. Avoid drinking coffee and high-caffeine teas.

Your body will sweat in order to reduce its temperature. Being in hot weather will raise your body temperature. If you are outside a lot during hot parts of the year, consider taking regular breaks indoors where it is cooler, or seeking regular refuge in the shade or under an umbrella. Public areas, such as coffee shops, libraries, and museums, often have air conditioning during hotter months. It is generally acceptable to spend time in these areas in order to relax and beat the heat. Though this may seem counter-intuitive, rinsing your hands with cool water can lower your body temperature, preventing excess sweat. Using soap will keep your hands healthy and bacteria-free. Make sure you dry your hands completely with a soft cloth after washing them. Excess hand washing may make them too dry. Either limit hand washing or consider using a lotion after washing. An alcohol-based hand sanitizer can also keep your hands cool. Cool showers are a great way to reduce your body heat in hot weather or long days. Take care that you don't shower too much; too much cleansing can leave your skin dry and without essential oils, which may interfere with healthy sweating. Consider using a moisturizer or body lotion, as well as an antiperspirant, after showering. Stressful situations can make you sweat more than usual. Control your stress levels through daily exercises such as yoga, meditation, or massage. Consider practicing different relaxation techniques, such as deep breathing, progressive muscle relaxation, and even laughter. Mix and match these techniques for your daily life in order to combat different kinds of stress--do yoga in the morning, for instance, and breathe deeply throughout the day. Warm baths can help you control your stress (and sweat) levels, even if they do raise your body temperature.
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One-sentence summary --
Avoid hot and humid places. Wash your hands often with soap and water. Take cool showers to keep your body from sweating. Control your anxiety and stress.