Hello and welcome to HealingWell,
I am glad you had your surgery but sorry to hear of your post op problems.
Follow-up care depends on the type of defect and whether other defects are present. For simple atrial septal defects closed during childhood, only occasional follow-up care is needed. For adults, follow-up care may depend on any resulting complications. It does sound like you are having complications and calling you cardiologist is a wise move.
If you have any reason to expect you need to be seen sooner please present to your nearest hospital ER. It is always best to error on the side of safety.
No need to apoligize as you concerns are real and we are here to support you. Remember 911 will get you immediate help should you need it.