I have a friend like that. The doctors told him they have no idea what's wrong. He's very frustrated about his ongoing health problems. He's not even in his 30s yet. I've tried subtly mentioning the clot shot as a possible cause (well, "subtly" by our standards) but it's a very difficult thing to accept. No one wants to admit that they were duped into cutting their life expectancy down to just a few years.