S.O.
Everyone take a big breath and relax!!!!
I am not a medical professional, but I have had painful and swollen glands before and so has my husband. When those glands hurt, it is usually due to inflammation or infection. I have one in my armpit and it really hurts right before my period every single month.
I have had mammograms, ultrasounds and biopsies done on it. A surgeon told me that the glands that are painful are usually not cancer, which makes sense. The ones that sneak by and grow without you knowing could be cancerous. That's why some people suddenly have a severe shock to learn they have stage 3 or 4 cancer in an area that never bothered them.
You guys did the right thing by having the N.P. look at it. Trust her opinion and check back a few days after the Z pack if things are not better.