How Do I Go About Getting A Prescription For 30 Pills Montelukast For Delayed Pressure Urticaria ?

I am a retired Belgian and reside in Florida for the winter until late April 2014. Over the years I have been diagnosed several times in Belgium with Delayed Pressure Urticaria, and can send you a copy of the reports by e-mail for confirmation if needed (med doss 29-31 in Dutch). The proposed treatments (antihistamines) did not produce any results. I recently read about the product Singulair (Montelukast), that may alleviate my rather debilitating symptoms of urticaria and bouts of asthma. How do I go about getting a prescription for 30 pills Montelukast (or generic) 10mg, for a trial period of 30 days, with while I am in Florida? I shudder to think of the plethora of doctors and tests to go through before finding someone knowledgeable and willing to prescribe. I d appreciate suggestions at YYYY@YYYY