Mindfulness Based Stress Reduction

I read the question/answers on mindfulness of feelings and emotions. When I am meditating on the breath unpleasant body feelings arise and they are noted. (Example: A wave of fear permeating the body. Not long after the fact, I realize that those unpleasant body feelings were a result of a thought. So, I get caught up in trying to label it correctly. I.e. Is it a body unpleasant feeling or a mind unpleasant feeling? This creates more anxiety and doubt. Do you have any suggestions on how to proceed. Thank you