for about two weeks I have been having painful lymph nodes in the neck, chest and groin, at times the pain is pretty intense and tacking tramadol to control the pain. I have also been experiencing lower body temp under 97.6, no other symptoms come to mind other than just not feeling well overall. I ve had mono twice, is it possible to get it a 3rd time?
As per your explanation I think you need to visit a vascular surgeon and get it diagnose first properly because it can be something else then just a pain in lymph node.  So do not ignore and consult a vascular surgeon.  If every thing is normal then do some stretch exercise along with your regular medication and do simple activity like walking or cycling and I believe it should be fine.  You can also use hot pack at painful area.  Hope this was useful to you.  Take care