Many people in my family, including myself, have various forms of anxiety disorder, and the worries you describe sound to me, a not-professional, like obsessions/anxiety.

There's no perfect solution to problems with anxiety, but there are things you can do to make it better. I would caution you though, about being choosy if you go the "therapy" route. Cognitive behavior therapy is said to be really helpful with anxiety, but "talk" therapy doesn't always help-- you are an intelligent person and you have already thought a great deal about your fears and realize that they are to some extent irrational. Just sitting down with a professional and telling them about them and having them tell you what you already knew may not provide you with much benefit.