There are other medications as well. It might go away with time as he gets experienced. I would rather prefer him to do meditation, yoga and get enough sleep to manage this conservatively without medicines. For any medicine you will need a prescription. Please meet your nearest Physician to get him checked to rule any cardiac cause.
Next Steps
I do home visits too just in case you need my appointment.
Health Tips
Avoid tea or coffee to manage anxiety. It might worsen the condition.