Are you seeing an infectious disease doctor ?
If not your pcp /Gi should recommend one.
Ds had a mystery swollen (golf ball size ) cervical lymph node
Just showed up over night
In his case wasn’t infection (they removed it and tried to grow a ton of stuff in it )
Was granulomas from crohns
he also had mastoiditis from an ear infection that would not clear up - needed iv abx for about a day or two then was fine
In that case pcp would not prescribe augmentin (which always clears his ears infections ) used zirthromax instead and it spread