minus the having a breakdown part, I did the same thing in a few of my interviews. the experience of sitting through that, as uncomfortable and terrible as it is, still helps. try to realize that as poorly as it went, there's just infinitely more opportunities. my meaning is that shitting the bed in a singular interview is fine, and furthermore you're still just fine after it. understanding that should hopefully lessen the burden on future opportunities, at least removing that small piece of stress from the equation.