I thought of this thread again because my lymph nodes swelled up again a couple of days ago. A couple on my neck and one above my collar bone. They seem to be going back down today but this happens to me frequently.
From everything I've read you only need to worry if they harden and/or get larger than 1 centimeter and don't go back down. Mine stay swollen for a day or three and then always go back down. But this NEVER used to happen to me.
I used to think doctors had all the answers but I've so much stuff going on with me that's unexplained that I've had to accept even in 2018 there's a lot that doctors can't explain.