Can anyone recommend a POTS doctor/cardiologist specialist in or near Miami, FL ?

[scoutmomdc]

My son, now 22, was diagnosed with POTS after several days of testing at the Mayo Clinic in 2015. He tried several meds for a few years but none of them seemed to help so he discontinued them after talking to his cardiologist. His symptoms were, more or less, stable for a while but he's now at college in Miami, hasn't seen any cardiologist for a couple of years and his symptoms are getting worse again so needs to see someone down in Miami (or within an hours drive) since he's aged out of the pediatric cardiologist he used to see at home, here in DC.      Thanks, in advance, for any recommendations.