I agree that most doctors (and receptionists) have heard it all before, so you shouldn't worry about being judged. I would come right out and tell the doctor that antidepressants have helped you in the past and you'd like to see if you could benefit from one again.

At my last pdoc appointment, I told my psychiatrist I was still feeling very depressed and because Prozac had been my mainstay in the past, I asked if I could try it again. He said no problem. I had no shame about any of it.

Good luck with working your way through this.