This extreme reaction to firing a gun is thankfully rare but it’s a condition that will drive a shooter to distraction if it does strike.
Recoil is the root of this particular evil.
Actually closing your eyes in anticipation of the ‘kick’ to the shoulder is, as I say, a rare reaction.
More usually the problem manifests itself as trigger freeze i.e a sufferer either finds it hard to pull the trigger in the first place, or he can’t release it for a second shot.
You can overcome the condition – but it involves a bit of detective work to pinpoint the cause.
Start by changing to a lighter, low recoil, cartridge and also have the fit of your gun checked out.
While you’re at it, get the shooting coach to watch how you mount the gun because a sloppy mount will almost certainly result in more recoil being felt through your shoulder and maybe also your face.
Over time, punishment of this sort can’t help but make a shooter more sensitive to the kick of the gun.
Excessive recoil can also be caused by worn extractors so have the gun’s headspace clearance checked by a gunsmith and replace the parts if the cartridge heads are sitting too deeply on the ejector rims.
If you’re particularly sensitive to recoil then consider having recoil reducers fitted into the stock of the gun – there are several excellent systems available, and they can be fitted easily by their makers.
Finally, try shooting with a gas operated semi-auto to see if that makes a difference because guns of this type absorb quite a bit of recoil before it reaches the shoulder.