Yes, when you are under stress your muscles will get tense and ache more for longer periods of time. Also your temper will be shorter and you will be angry and nervous in dealing with other people. So the best thing is to reduce strees even if it means staying in bed for a few days resting up. Stress causes problems with your sleep patterns and puts all your daily projects to the test of getting anything done or done right.
Learn to say no, and rest as much as possible. Do not over do, but pace your self to get jobs done. Relax and smile a lot.