Thanks for posting your query.
Pain during swallowing definitely indicates some sort of hindrance inside your throat.
Pain on left side of collar bone may be due to inflamed thyroid
You should consult with internal medicine specialist and should go for thorough check up.
There may be possibility of throat discomfort due to recurrent acid reflux
but still it will never cause pain at left collar bone.
You should take anti-inflammatory, proton pump
inhibitors and antibiotics for faster recovery.
You should also go for endoscopy
Dr. Mayank Bhargava