Where is the fear/anxiety coming from...perception/anticipatory anxiety or physical signals/symptoms? If its the former there is approximation, desensitization, imagining, hypnosis interventions. If its the latter something like learning diaphragmatic breathing, bio-feedback or a beta blocker medication can work really well. It might a bit confusing to sort out...but a backwards approach called...psychopharmacological diasection using a beta blocker could be an easy rule out/in approach or just try the diaphragmatic breathing first. Often using a combination of both approaches can work really well. Go see a professional if its that big of issue.