You'd be an excellent combat shooter at least for the first target.... Sounds like a breathing or heart rate issue. Do you wear a smartwatch that monitors your pulse and respiration? That might give you a few clues.
Yep, have a problem with anxiety. So, when I'm having a good day, I shoot well, when I'm too stressed, can't group worth a dang. Much better than it used to be, so I have that going for me.