Golly Gosh - what an emotional roller coaster ride you've been on, @Mia1965 ..... that is terrific that the PET scan was all clear ..... and good that they are actively monitoring the enlarged node - but totally understandable that you are anxious, as we all would be. xx. Sending you big hugs
Out of interest - have you had a CRP blood test any time recently? (The C-reactive protein .. CRP .. test is a blood test that checks for inflammation in your body.) I've had arthritis for the last 20+ years and my blood tests pretty well always shows higher than 'normal' CRP levels (even VERY high) ..... so much so that my GP was always expecting them to be high & didn't worry about them, until I had a bad reaction to VIOXX (an anti inflam drug) and the markers went thru the roof!! THEN, she got worried!!
Maybe also get your current meds looked at/audited by your pharmacist, to see if there may be a conflict of interest there? Sometimes, mixing 2 innocent drugs can bring on an unwanted side effect (even over the counter drugs.) :(
Or ... a request for an MRI (that shows more 'flesh/muscles/organs') might be in order? And a complete blood test too ... as they'll be looking for ANY thing that is contributing to the enlarged node xx
take care & all the best ...