Thanks for providing more information.
Well as you describe possible causes may include Gastroesophageal reflux disease,Sinusitis/Pharnygitis.
And usually Chest X-ray,EKG,CBC findings are normal in such conditions.
You need to be seen by an ENT specialist for a clinical examination,Larngoscopy,Throat culture.
In the meantime you should try OTC Claritin.
Swollen lymph node can be caused due to defensing mechanism of body to fight infection(it can be viral).
And it usually resolve by it's own when your infection gets clear.
You should take OTC Motrin and apply warm compresses on affected area.
Also do menthol steam inhalation and saline gargles which relieve stuffy nose,throat irritation.
Start a multivitamin supplement which increase your immunity.
And drink warm liquids.
Avoid spicy,fried foods,carbonated beverages.
I want to assure you that chances of cancer are very less likely in your case and you shouldn't worry about it.
Sometimes anxiety makes the physical symptoms and sometimes physical symptoms make person more anxious.
So make an appointment with an ENT specialist rather than visit ER.
I hope this helps.
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