My biggest fear is that I will stop breathing. I think my throat will close. Can anyone help me understand why this is not possible. Or help me cope with this fear. This is always the trigger to my attacks. I even carry a pulse oximeter with me at all times. If I could cope or control this fear I know the rest would be downhill. reasons why not, ...... excercises ..... techniques ..... understanding of how breathing works .... any of these things might help.