"Ear drum machines" are nothing, I had an infection in one of my ears a substancial amount of time ago and had two machines prodded into them, doesn't hurt at all, just a little bit of 'discomfort' - which, is enjoyable in an irritable way; kinda like scratching an itching spot, if you know what I mean.
Also, if you're worried about getting naked, then, well... the Army's not suited for you. Obviously, all medical personnel will be professional and "in the field", you'll have to deal with **** 10x worse, in the line of duty - bullets, hygiene regiments (yes, you must keep yourself clean - especially the feet), controlling adrenaline and of course, dealing with emotional pain.