I believe I do need to post something here in the vein of the recurring "Have you made your appointment" thread.
I noticed swollen lymph nodes three years prior to being diagnosed. The ENT did a CT and basically said "it's probably nothing". I went back to him two years later and said "Hey doc, these things are bigger." Got another "you seem healthy, probably not an issue". About a year after that I went to a different doc and said, "I don't feel right, what's going on?" That lead to blood work and a biopsy with the diagnosis.
The truth is that with some slowly progressing diseases it can be easy to miss. I tend to not go to the doc for anything. I though that I was just gettin' old and needed to hit the gym harder. That wasn't working. I clearly remember being so tired at Nationals in Idaho that I was debating whether to go down the levy to watch my daughter ski before my event on the other lake due to how tired I was. Looking back that seems silly, but you really don't know what you don't know.
The moral of that story is to get things checked out. Even then, be sure you feel good about the advice you are getting and seek elsewhere if you're not.