Reverse the situation.
The bottom line is no one can make you sell your home and no one can make the buyer continue with the transaction.
This happens all the time. Let your real estate agent know what's going through your mind. If you decide to discontinue be prepared to reimburse the buyer any expense he/she incurred during this transaction as it relates to the purchase of your home. Examples of reimbursable expenses are appraisals, home inspections, pest inspections, and title fees. While reimbursing the buyer make sure you make that the final piece of the transaction.
If you attempted to facilitate the transaction without an agent contact the buyer's agent and if that fails contact the buyer. It may not be as bad as you think. If you don't get anywhere with them pull out the yellow pages.
Again you can't be forced to do anything you don't want to do. Read that contract carefully, there's always an out.
The "P.C." stands for Professional Corporation.
What you're seeing is not actually the attorney's name. It's the name of a company (corporation) that the attorney founded, and usually that the attorney is the sole owner of. They just give the corporation the same name as themself.
Corporations are a common way to reduce personal liability in case you are sued. If a corporation is sued, only the corporate assets can be taken, not the personal assets of the individual owners (shareholders).