GS
I am not medically qualified just a pilot who has always been interested in things medical ; )
It does sound like you have panicked yourself and obsessed over this ?
That alone anxiety can cause a tight chest. Muscular aches, shallow breathing, dizziness, racing heart etc.
I would take a medically qualified opinion given by Homonculus and do nothing till your medical!
Also keep off googling on the computer and scaring yourself silly!
As stated and this is only instinct I would put money on it that there is nothing wrong!