It is fine to let your doctor follow them over time. If they stay the same size, or shrink, that is good. Pathologists call them benign reactive nodes for lack of something better to say. Essentially, they are just saying that they see some extra lymphocytes in the node, but that they look normal and healthy. Thus, benign (normal, healthy, non-malignant), reactive (reacting to something we don’t know, likely normal or nothing) nodes.
To a certain extent, you are probably a victim of today’s medical world. Years ago, a doctor would probably have tried to reassure you over several visits that everything is ok. Now, doctor’s are rushed, patients get (mis)information from the web, push for tests (like CT scans) and sue if something goes wrong. So, of course, a doctor will order multiple tests if you complain and are anxious about something. From what you have said, your tests have been negative or normal, with no sign of cancer, autoimmune disease (save your low titre ANA) or infection.
I suggest, again, that you try to relax (or seek out someone to help you), and follow up with your doctor at regular intervals.