Based on what you are saying, you may have a claim agaisnt the seller, the real estate agent and the home inspector. You should speak to a real estate attorney who litigates (as opposed to one who handles closings) without delay to learn what your rights are.
If you're concerned about cost, think of the investment that you made in buying a house - you can't afford NOT to speak to an attorney to assist you and explain your rights and see if there is time to either rescind the contract or file suit. Some attorneys will do a short consultation for free, others charge a nominal amount. It's also possible someone may take it on contingency if they believe there was an intent to commit fraud, or was some form of negligence.
This is not intended to be legal advice or create an attorney-client relationship. If more information is needed, you should consult with an attorney in your state regarding the specifics of your situation and the options available to you.