Hi, i have noted your concern,
Coming to a diagnosis of cancer will be to early to say just be seeing neck swelling, kindly let the doctors do that job for you, so let them evaluate and tell the diagnosis.
Sometimes neck swelling can be due to multiple reasons
Ear infection, sinus infection, dental infection, some rare type of infections, autoimmune diseases, cysts, lymphnodes, viral infections lastly cancer.
Next Steps
Kindly follow the advise of your doctor and just relax as of now until and unless you have the report of FNAC ok