Get something else to focus on. As for telling them abiut your past you could write a note and hand it to them if you don't want to say it. I wouldn't think they'd do a full exam if that area is open since that'd pull on it. Do you have an anxiety medicine? That might help with tensing up or explain your past and ask for something or the anxiety? (Make sure you don't drive there if you decide on that) Pain wise it is easier if you can relax those muscles.

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