I am 43yo male, and recently had US and CT scan of the neck to investigate two swollen lymph nodes which were present for longer than a year in my left neck. Several nodes were found on the jugular(mid) chain, many sub-centimeter and 5 >= 1 CM the largest ones were 2.26, 1.65 and 1.55 CM. They are on both sides of the neck and under my chin as well. Nothing else was found in CTs of abdomen and groin. I have a biopsy scheduled for next month, but have read myself into anxiety attacks. I have read that anything above 1 CM is abnormal. I have no pain in the nodes themselves but have developed pain in the neck which seems like a stiff neck, and pain exists with any pressure from straining or lifting, also movement related pain in neck, chest and spine in the same region. No signs of infection at all, but do have extreme fatigue, back pain, some weight loss, among other varied symptoms. My Primary Dr said since no other enlarged nodes were found in other regions, he is not concerned about lymphoma.
Are there other conditions that could cause lymph nodes to be swollen for this length of time? Should I be as concerned as I feel about this, or is it more likely not related to something serious? Is it possible to have lymphoma without nodes in other regions showing signs? Are biopsies only done when cancer is suspected? Any other info or suggestions are welcomed, I am not usually one to worry about such things, but for whatever reason this has me having some anxiety waiting for the biopsy.