This is a really bizarre and personal thread to run into my first time on these forums. But heck, I'm game.
2004. I was deployed with the 2nd Armored Cavalry Regiment in Baghdad as a medic. An SF squad operating in the area's medic was wounded, and as the area support squadron, it fell on us to provide support to them as another 18D wasn't readily available. First guy's week went uneventfully, and the second literally got shot 8 times in a friendly fire incident a few days later.
You can imagine my mindset going in to replace him.
Came to a two floor structure SW of the green zone around 0200. SFC "Jack" instructed me to wait by the truck while the squad secured the objective. I hunkered down against a concrete barrier by the road and watched. Point pushed the door open and immediately a freaking grenade came flying out and hit the barrier. The percussion from the blast reportedly threw me a few feet. I couldn't hear anything. I felt ... I felt like I was dying, because I was. You know the feeling in your lungs when you've been holding your breath too long? It was like that, but everywhere, all through my chest and guts and head and everything started going white. The only thing going through my mind was a frantic need to do something, anything, but I couldn't move. It was like being turned to rock AND on fire.
Next thing I knew I was choking down a huge gasp of air as one of the SSGs was cocking back to punch me in the chest again. The percussion from the grenade had apparently thrown off the rhythm of my heart. I felt like I had just run ten miles, twice.. though surprisingly outside of a wicked migraine I was able to just walk it off and regained most of my hearing within the hour. The four wounded in the house were beyond any field medic's help anyway, so I guess we lucked out there- out of the three we were able to extract for questioning, only one was hit, and he probably would have made it with a field bandage and a slap on the flank.
Tl;dr: If you ever get a chance to NOT get blown up, take it.