The numbness and tingling at the back of the head and face can be referred to as having less or no sensation in the skin of these areas. This can actually happen to any parts of the body. The sensation may be felt or characterized as prickling pins and needles, creeping, and ant crawling [1].
the crime of solicitation must be proved by the testimony of at least one witness and corroborating evidence the crime of solicitation must be proved by the testimony of at least two witnesses or by the testimony of one witness and corroborating evidence
But proving that one was under duress is another problem entirely. In evaluating the status of a contract, of course, one cannot simply render it null and void by claiming that it was signed under duress. It has to be proven that the contract was signed under duress. How is this done? As is the case across U.S. law, there are a number of ways to prove that something occurred. One is eyewitness testimony, which would go a long way in showing that you were indeed under duress when signing a contract.