This is particularly helpful in the bathroom and kitchen. Ask your doctor for a disabled parking permit. There's no use going shopping if you use up all your energy walking through the parking lot. Eat small, frequent meals. This regulates blood sugar and can minimize some symptoms like dizziness and nausea.
Exercise is important, but start very slowly.
For example, walk on a treadmill for one minute a day and increase in one minute intervals as tolerated. If you feel worse the next day, you've done too much. There are also some exercise videos designed for people with fibromyalgia. Never use up all your energy. Be sure to spend some of your energy doing things you enjoy.