Let's face it, nothing that you worry about is really important enough to be allowed to affect your shooting - the one thing that you do well and enjoy doing. Worry never produces a happy solution to any problem, and only serves to fill your head with unnecessary poisonous fuzz. If in training, we are able to establish a physical and mental routine for the treatment of each individual shot as a match in its own right, we eliminate straightway any faults in preparation or techniques that will throw us off balance and produce emotional upset - we will be able to remain relaxed at all times, keep our 'cool' and shoot with the ease and grace of Champions. Don't leave preparation to the last minute and then have to rush round like a Jerboa - your score is ruined at about the third set of red traffic lights. Take your time, make time work for you.
Shooting is a sport, enjoy it.
You must of course be possessed with the presence of mind to accept some bad with the good. Gut if you are relaxed enough and can be tranquil through all adversity, to produce the precise exacting conditions for the release of one shot, this then is the course of action you must force yourself to adhere to in order to rectify this state of affairs. A method of inducing relaxation is all you need to minimise tension effects. In tension, adrenaline bleeds into the bloodstream, the liver steps up its sugar release to the muscular system and all your senses go into A1 readiness. Digestion slows down, breathing becomes shallower and blood pressure increases.