Are you bathing your organs in the stress hormone of cortisol? If so you could be overworking your adrenals, activating the insulin producing section of your pancreas and causing that excess weight around your middle which can in turn eventually affect the function of your thyroid. The answer for most of us lies not in getting out and running another five miles but in doing the reverse by slowing down. Your body is already overworked and asking for you to rest, slow down and ground. It is begging for your attention to not push things more by adding more activities to your day. Find ways to reduce your stress such as getting away from your desk at lunch and going for a walk or maybe just finding a quiet space to meditate for 5 minutes. Looking at your diet is important too so be sure you are not eating too many processed foods. Try switching to warm veggies and organic grains for some of your meals and remember to make lunch the largest meal of the day when you can.
Here is a pranyama (breath work) that works beautifully to balance the parasympathetic and sympathetic portions of the nervous system. Nadi Shodhana, also called Alternate Nostril breathing. Try this daily for 10-15 minutes a day and see how this breath relaxes, grounds and supports you. Maybe add this to your lunch hour, it is delicious.
Take a soft inhale through both nostrils, then softly exhale out both nostrils. Gently close off your right nostril with your thumb and inhale through your left nostril, pause at the top of the inhale, then release your thumb and close off your left nostril with your ring finger of the same hand simultaneously and softly, gently exhale out the right nostril. Pause at the bottom of the exhale, then close off the right nostril and inhale through the left. Repeat for 10-15 minutes and let the breaths be so gently that if you had a feather by your nostrils it would barely move. Begin and end the breathing with the left nostril.
When finished just let both hands relax in your lap and pause and feel what Nadi Shodhana has to offer you each time you practice.