Hi ddt972,
There is more about dust mites and allergies in post #2 here that should be helpful but your doctor’s suggestion is a good one as part of a larger “multi-pronged” strategy to reduce allergens in your home or sleeping environment.
You’ve probably seen this already but just in case you haven’t … the better options and possibilities I’m aware of in the Houston area (subject to the guidelines here) are listed in post #2 here.
I’m looking forward to finding out what you end up deciding and of course any comments or questions you may have along the way.
Phoenix