My suggestion is to call your dr. or go to the ER. Chest pains and difficulty breathing or being short of breath could be signs of something serious such as a heart attack, pulmonary embolism, etc. It's not something you want to mess around with. Better to get it check out than wait until Friday. Friday is too far away for the seriousness of what you are describing. IMHO.

Let us know how you are doing and what the dr. says.