My undergrad transcript is... confusing, to say the least. My overall GPA is 2.9/4.0, which is technically below the cutoff for most programs I applied to. It consists of several semesters of straight As, several semesters of all Fs, and a lot all over the place in between. I have lots of other reasons I am a good candidate (170/170/4.5 on the GRE, several years of research experience, really solid letters of rec), and have already gotten at least one interview (waiting to hear back from all other schools to which I have applied).
This last summer, when I was several years out of college, I was diagnosed with Generalized Anxiety Disorder, which made everything about my undergraduate difficulties finally make sense. I've been told repeatedly not to mention mental illness in the SOP or what have you, so I didn't, but what happens if someone asks me point blank in the interview what the heck was going on with my grades? I honestly believe that now that I'm managing it, anxiety will no longer be as much of an issue in grad school, but how do I tell interviewers "I'm confident this won't happen again" without coming out and copping to mental illness? There was no improvement toward the end, so I don't even have that to point to.