Priceline.com Expedia offered same hotel room at $25.00 less; the hotel offered less expensive room. Insurance claim denied with doctor's letter and records. Internet

I booked two rooms through Priceline.com name your price.  I was expecting a much nicer hotel than a LaQuinta for the price I named.  I also paid for cancellation insurance, which did not specify any illness that would not be covered and in fact stated even pre-existing conditions would be covered.  I have history of anxiety and panic attacks, well documented in my doctor's records, including medication prescribed.  When I learned that the G20 would be meeting in Pittsburgh, with protesters and high security, I was too "panicked" to attend a wedding there that weekend so I cancelled my trip and filed claim for reimbursement, complete with doctor's documentation.  I received a letter from MercuryUSA, the insurance company offered by Priceline.com denying my claim that anxiety was not a covered illness.  I also later learned that a room at this same hotel was available through Expedia for $25.00 less per night AND even the hotel itself charged less than Priceline.com.  Priceline.com is a total RIPOFF.