Alright, missjena…here is my story: I had an enlarged lymph node for most of my childhood. It was always big, and grew bigger when I was ill – even a pimple on my face could make it grow. I had a biopsy of the lymph node when I was 15 years old, because an uncle had Hodgkins disease. The docs initially thought it was about the size of a peanut, but once they got in there they found it to be the size of a golf ball. Since it was so large, they did not remove the whole thing, just cut a wedge out of it for biopsy. After the longest week of my life, I got the results: benign.
The remaining piece of lymph node (about 3/4 of the initial size) is still just as big as ever, and I am now 41 years old. I have never (knock on wood) had any kind of cancer. It has never caused me any trouble at all, except for the annoyance of it’s noticable existence.
There is no reason for why it’s enlarged, it just is. That’s just the way some of us are made. I understand that you’ve worried yourself half to death over this issue, but it’s time to let it go. Trust your doctor.