Let me preface this post by saying I, personally, think you're an idiot if you go into MEPS with the mindset to lie.
That being said, my doctor hardly asked me anything during my physical, or maybe I was just in a haze from being at MEPS all day (was one of the last to get their physical before the duck walk) that I can't remember. They don't really press you too hard if you say "no" to any of the questions, though, I do remember that (for instance, I have a scar on my spine from a cut when I was a child that looks like a surgical scar, the MEPS doctors asked me ONCE if I had back surgery, I said "no, I cut my back when I was a child" and they took my word for it).
Best of luck, I hope everything works out for you, but there's really no reason to lie. If everything's alright with you now, why not just tell the truth?
