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Does the contract say anything about a right to cancel? If not, did you happen to sign it away from this company's normal place or business? Were you solicited by a home salesman?
Unfortunately, then, there is no state or federal 3-day cooling off period that would permit you to unwind the contract; however, I think you will find it pretty easy to obtain a doctor's note that says it is recommended that you stop the treatment. If you do, they must let you out of the contract this way.
No, that does not matter. Here the contract would control as there are no other laws to let you legally unwind the contract.