Welcome to HCM
We understand your concerns
Don't be anxious first. It is to be thought about carefully and a solution should be found. Let me help you. Ribs start from just below the throat. You can check the internet for human bone structure.
Secondly you should believe your doctor. if he says that it is nothing to worry. believe him. If you are not satisfied with current doctor find another who is believable. You can request for Xray and any doctor would do it to remove your doubts, you should state the reason properly.
is a cause of concern and the cause of your hand numbness
and burning of breast bone. consult a psychologist
for counseling. I can help you online if you desire so.
Get well soon.