Surely you are in right direction, all symptoms you have explained in your mail are associated symptoms of abnormal Mitral valve function. An ECHO test will clear the picture for this.
I would also want to know any history of pedal odema?
If ECHO is within normal limit, than regular medication can do the rest of thing. But you have to repeat you ECHO every year, so that we can know about the functioning of the valve weather decreasing or not.
Else you may need a valve replacement
surgery, all depends on ECHO report. Surgery is the best treatment in valve prolapse but its better to spend as much time as you can with your natural valve.
Medication is always needed either before surgery or after surgery.
Please consult your cardiologist and go for better treatment.