Hello,
Being an informed patient is very important, but try not to scare yourself. Brugada is a very rare syndrome. What your doctor probably means by secondary symptoms is that you don't have any high risk features for Brugada syndrome.
If you are not a physcian, you are not going to be able to read an EKG. Even the then, the experience difference between reading EKGs as a primary care doctor versus a cardiologist or electrophysiologist is great. Brugada is not an easy diagnosis to make. You need your cardiologist to help. If you doctors felt this was an emergency, I don't think they would make you wait 3 weeks.
I do not intend to belittle your concerns -- I know just about anyone can work themselves into a frenzy by reading about conditions. Keep in mind that medical diagnosis are often like a horoscope, you can read a lot into them to make it sound like you have something that you don't.
I hope this helps. Thanks for posting.