Hi,
   Thanks for the query. I understand your concern.
    Palpitations from any cause apart from heart problem-can present as the same symptoms.He definitely  needs detailed medical check up to locate cause
    * 
Chest pain , 
jaw pain ( symptoms of 
heart attack ), breathlessness, short breath , light headedness nearing to passing out  should be taken as an emergency & patient needs prompt treatment in such a time.
     In such condition you should call 911 & seek immediate medical aid. 
      * The 
home care to reduce the symptoms & prevent adverse symptoms till you can take for detailed expert check up to confirm the cause & specific management are-
     - To avoid the stimulants like  coffee, alcohol or cold medication.
     - Drink sufficient water, green leafy vegetables & coconut water.
     - Have light , easy to digest food in small quantity several times a day.This would avoid 
indigestion.
     - 
Diabetes or blood pressure or 
hyperthyroidism  medicines,  ... if taking any... to be continued.
     - Avoid psychological stress, physical stress or anxiety.
    Thanks