Cervical smear result abnormal cells - scared!!!

Hi, I just got my letter back about my smear test that was done 3-4 weeks ago to find that I have abnormal cell changes after the previous one a year ago came back HPV positive (no cell changes). I've now been referred for a colposcopy but it isn't for another 8 weeks or so (at the end of Jan next year) I have all number of things going through my head but I'm worried they'll discover something bad when I go, never mind the fact I've never been for one!! What if they realize I actually have something more sinister and the smear test didn't catch it? How quickly can things develop in these two months? Will it change into something much worse???
I get frequent pelvic pain and back pain quite often in general as well as on my pelvic floor , especially every month which seems to be around the time of ovulation. It scares me so much that there's something bad!!!

Has anyone had a similar experience with borderline changes and it been just that? How likely will it progress to something else? How quickly will this happen?

I'm so anxious as I have health anxiety anyway so this just adds to things, as well as the fact I feel a bit alone, my mum isn't in the country right now and had an accident so she's recovering from a broken hip in Australia.. I also don't want to add on to her worries as well.

If someone can reassure me or tell me what to expect I guess it will help calm me down a bit. I really didn't look beyond seeing I had abnormal cells (borderline - high risk) so I don't know whether it's likely they will turn into something or whether it is possible it's something bad but didn't get picked up on the smear test.

Thanks to anyone reading this.