Slow breathing helps you relax. It calms your mind and lowers your heart rate. This is why you should learn some useful breathing exercises that help you breathe right. Every time you are stressed, and feel your blood pressure rise, move to a quiet corner. Sit in a relaxed position and breathe in through your nose. Do not allow your chest to rise, but make your stomach move. Breathe in and count till 8 in your mind. Now, release your breath within the count of 8. This will help calm your mind and lower your heart rate. It will lower blood pressure immediately at home as well as in office. Apart from this, you should try meditation, yoga, pranayama, and massage, and should take a short nap during the day to keep your blood pressure in control.