Swollen lymph nodes on the right side of neck

I have 3 (that I can feel) swollen lymph nodes on the right side of neck (cervical area I think) and two on the left (same area). They are very movable and somewhat "soft". I have had the ones on my right side about 2 months and the ones on my left about 2 weeks. I have had a CBC and "chem-blood-work" (I can't remember what it's called -- it checked my co2, protein & so on), liver blood-work, Hpylori (sp??)test & a thyroid test. All came back fine. I have had a chest x-ray and it was fine. I have not lost any weight, no fevers, or any major symptoms. The only strange issue is I seem to get heart-burn / acid reflux every evening right after dinner - and sometimes with a little "burning" in my upper stomach. I seem to be able to eat what I would consider a "normal amount" (I don't feel like I get full fast, I just get heartburn after eating dinner -- and only dinner). I'm having trouble getting my insurance to approve some further tests, but I'm slightly worried about lymphoma. Are there any other issues that can cause these type of lymph nodes for a 2 month time period with regular heart-burn. I am 39yr old by the way.