Hi bryan,
I can understand your situation. Cancer is just 0.4% possibility in people who have swollen lymph node. So there are more infection which will cause swollen lymph node.
firstly please go to ENT and ask him to take fnac test. Fnac is a simple test in which they will take sample from your lymph node using syringe. Also get the culture of the sample. This will surely give you a relief.
I had similar situation recently. just terrified cause of cancer fear. Thank god its not cancer.