The good news about being in the army is I see a doctor at least every 90 days. It's well documented.
I completely agree with you on this scenario. People often underestimate how loud gunfire is indoors without hearing protection. Unfortunately, I had a friend test out the remodeling capabilities of his Mossberg 590 on my ceiling. Turns out they are quite effective at installing sky lights. But! after it went off I could barely stand because I was so dizzy. It felt like the room was pulsating for a solid 10 minutes.I recently purchased some amplified earmuffs to use in a HD situation (if time permits.) It would be the last thing I'd worry about but want the option available. I have multiple layers of protection that "should" give me adequate time to put them on.
As for their effectiveness, I just took them to an indoor range this week to try them out. I had them amplified so I could hear normal sounds. Then, before I could get a round off with my HD shotgun, a guy two lanes over unleashed a hellishly loud full-auto rifle. (The range rents full-autos). Although it was not deafening, it still was not very comfortable. I don't think those amplified muffs were designed to handle full-auto rifles. When he ran out of ammo I quickly put in my foam plugs as well.
However, I figure if those amplified muffs made an extremely loud full-auto rifle endurable then they should work fine in a HD situation. Again, they would be the last thing I went for after arming myself.
Sordin is a very good Swedish brandI have a two pair of MSA Sordin headsets. They hang on a bracket on the bed rails. Batteries are replaced once a year unless they have a lot of range time, then it's every six months. These clip the gunshot an also enhance you hearing.