I've experienced this more and more. Has anyone had their heart checked. I have a mitral valve prolapse that causes anxiety, which, in turn, makes my stutter worse. Recently, I've started getting worse stuttering and more chest pains, and I found out that I have something else going on with my heart. I have an apt with the cardiologist too. I try and relax but the mitral valve prolapse gives me bad anxiety attacks and I can't help that. It's a flaw in my heart.