I and I'm sure everyone will totally understand your feeling so worried.
I was in the same situation last oct/nov with a high grade smear result. Having had a recall letter from my mammogram last Jan then treatment for very early breast cancer you can possibly imagine how much of a panic I was in for the smear recall.
The waiting for the colposcopy and imagining how bad it could be was the worst 2 weeks of my life. Worse than getting the results of the breast biopsy.
For the colposcopy you will probably
Be a nervous wreck in the waiting room
Be treated very gently and sympathetically by lovely nurses
Possibly find the speculum bit worse than any actual biopsy/treatment
Be offered the chance to see on the screen what the Dr is finding/doing
And hopefully be told that things are very manageable. Though it sounds as if they are expecting to do biopsy before deciding on actual treatment.
It's going to be a long wait, long weekend. Try and keep busy.
All the best.