I get really bad anxiety that my son is going to die in his sleep at night sometimes. It's worse when he is sick, but I get it sometimes when he is not. I had it a lot more when he was very little, especially at the age where SIDS was a worry. From having talked to others, I think it's somewhat normal as a parent. I could be wrong though... We love our kids deeply, and losing them is many parents biggest fear. I'm glad your son is ok.