There is NOTHING to be embarassed about, really. I know sometimes it can be uncomfortabe to ask your doctor about issues like this, especially if your doctor is male, but really, your doctor has heard it all before.
With that being said, I am usually a little uncomfortable after my pap smears, but not to the extent you seem to be. My discomfort usually only lasts a few hours, not several days. Your discomfort could be any number of issues, from a mild yeast infection to a latex allergy to a reaction to the lubricant used in the exam to...anything. It's probably something that can be easily fixed.
I would call your doctor's office and at least talk to the nurse. The nurse can assess the symptoms and tell you if you need to be seen, or if the doctor needs to call in a prescription for you, or if this is something tht will just go away on its own. Hang in there!
Again, don't ever be embarrassed to ask these questions! Chances are that if you have the question, so does someone else. :)