My 13 year old son was born with a heart murmur. A couple of months ago, I had to take him to the hospital because he had passed out right after taking a hot shower. He then became weak and could barely walk. Well, the dr at the hospital couldnt find nothing wrong with him, after performing multiple tests on him. Just yesterday, the same thing happened. I was asleep and he woke me up saying he fell on the floor after taking a hot shower and he blacked out for about 3-5 seconds.He came to my room tired and exhausted with his eyes barely open. My question to you is what should I do since this is the second time this happened? Should I take him to a specialist? I'm really worried.