Anything goes wrong in body the first reaction by our immune system is increase in temperature of body. Here you have told about the symptoms of enlarge cervical lymph nodes and I believe you have already done some treatment as well as lab reports and your jugular vein is also protruded. Also there is a symptoms of neck and shoulder pain. Let me explain you without physical examination it is not possible to suggest exact treatment planning but in general I can suggest if there is a pain and too much of swelling at cervical lymph node which is not responding to medication you should go ahead for surgical opinion with your doctor suggestion now even after this if there is a cervical as well as shoulder pain is continue then you can visit orthopedic doctor for further examination and check up here ortho doctor will suggest you for surgical correction if there is major damage found in cervical spine or shoulder level. For anything minor to moderate problem I will suggest you for conservative treatment planning along with physiotherapy treatment. I suggest, you can also used hot and cold pack at your home for cervical and shoulder pain to have some more relief. I think you have told its benign that means you have all ready done biopsy of lymph node but if not then do it immediately to take proper early medical steps for your treatment. I am sure if you follow this properly then will be helpful for you. Take care.