after an airplane flight, a 60-year old woman, with a history of chronic anxiety, developed deep vein thrombophlebitis (blood clots ) and a subsequent pulmonary embolism (blockage in the lung). over the next year, she focuses relentlessly on every sensation and pain she experiences and repeatedly seeks medical attention for these symptoms, which she worries is due to recurrent blood clots, despite all negative test results. review of symptoms reveals that she also has chronic back pain and that she has consulted many physicians for multiple symptoms, for which all test results have come back negative. what diagnosis best fits this picture?