My son has been in the Er 3 times in 2 weeks. He gets real sweaty and feels really anxious. When he has gone in, his blood pressure rises. He has had tests taken every time. His heart is good and the doctors say it isn't AFIB. But none of the 3 doctors have given him a reason as to why this keeps happening and can't give him an answer as what is causing this. He thought he was having an anxiety attack, but this is happening too frequently. Any answers?