I am trying to find all of my posts whether responded to or not.
I tried a search for
user:fixit7 but it found nothing.
User nickname is changeable and not necessarily unique, you need to use the unique numerical code associated to a user. So try
user:573838. Alternatively, for self-posts, you can also use
Also in order to find your questions with an answer you may use
answers:1 (in general
answers:n for questions with at least n answers). So simply search with