Just wanted to say I know exactly where you are coming from. I have always dealt with manageable health anxiety but when I got my letter about abnormality through in April it really went into overdrive like I have never known before: oddly, not about CC, but other cancers (though I have quite an odd approach in that I become obsessed with researching and deciding I have XYZ, and yet honestly I am not fearful of the prospect, I just get extremely preoccupied and upset about 'what if?').
But I digress a little. I found the colposcopy to be immensely reassuring...perhaps why I have focussed on highly unlikely 'others'! Like you, my consultant just took a few biopsies initially because he could not decide if the changes looked mild or moderate - moderate they treat, mild they leave for 6 months - and I was also travelling a couple of days later! Like Lemoncat says, I think they prefer to approach with caution e.g. not whip out a bit of cervix if they don't need to. My results have come back now as moderate/CIN2 so I am going to have LLETZ in a couple of weeks. The positive for you is that your last smear was normal and if you have been regular on your smears before that in the really really slim chance that there is anything sinister at all, it'd be at a super early stage - but please don't get hung up on this, which I know is easier said than done.
I'd also back Vicky on talking to women in your day to day life if you're comfortable doing it - this forum is a wonderful bunch of experienced, tough and supportive women, but you'll be surprised just how many ladies you know will have dealt with this themselves or will know a woman who has had treatment. Loads came out of the woodwork for me and it really does put you in a good place, that is, this is a pretty common situation to be in.
P.S. If you want a bit of light relief and haven't seen it, watch Catastrophe on 4OD...smear abnormality plays a pretty big part and it's a right laugh.