Wash your pillow every week or put a zippered plastic or fabric coating on it. Your bedroom should have a hardwood, tile or linoleum floor. These surfaces are easier to keep clean than carpet. Ask your doctor about using this solution. Also, try not to place your carpeting on concrete.
Mites live in the warm space between a rug and concrete.
If you're highly allergic to dust mites, however, the best approach may be to remove your carpeting. Vacuum your carpets and upholstery every week. Vacuums with high-efficiency filters pick up more dust mites, but even standard vacuums work well enough. Clean up surface dust as often as possible. Consider upholstery-free furniture.