I went through this too in the summer with my two girls. I had a swollen lymph node in my neck and I started feeling my girls necks for the same thing while putting on their sun cream. I was also checking their knees as I thought one of them had got a lump but it was a bone and needed to check my other daughter to make sure. I've managed to come through that but still stressing about other health issues. It's such a difficult thing to overcome.