Some thoughts from Col Grossman
I found these on the "Sheepdog" facebook page and while I am not a fan of the term they do have a lot of Grossman's quotes.
If you get holes punched in your body, blood will come out. On rare occasions, the contents of your intestines may come out, too, but do not worry about that because someone will clean it up, but most of the time blood is going to come out.
How much? Well, your body holds approximately one and a half gallons of blood, and you can lose 30 percent, approximately a half gallon, without losing your hydraulics. To see what that much blood looks like, take a half gallon of strawberry milk and pour it on the ground. Yes, it is a large puddle, but tell yourself that that is the volume of blood you can lose and still fight.
Erase all doubt that you can keep going and keep fighting.
Know that if you stop before you lose that much blood, it is your will that failed, not your body. Lt. Col. Dave Grossman, On Combat
Don't worry about the guy with the red face, he's just mad. Worry about the guy whose face is white with vasoconstriction. He's the one preparing to fight. Lt. Col. Dave Grossman, The Bullet Proof Mind seminar
Just a couple of things to think about.