It sounds like you're suffering from acute paranoia and imagine that something is wrong, but that doesn't mean that there is no possibility of an after effect from the surgery. All those X-Rays might be considered unethical, especially if they were concentrated in one area of the body. X-Rays can make you sterile and can cause cancer, but that doesn't mean you have been effected, just stay away from X-Rays and get a regular checkup. Ask the doctor if your thyroid might be effected by the X-Rays. Be vigilant and keep checking yourself, but don't convince yourself that something is wrong.