I had my first smear test a couple of weeks back and my result came back the same as yours, high grade dyskaryosis.
I had my colposcopy yesterday and the doctor said I needed LLETZ treatment. He did it there and then under local anaesthetic and sent the abnormal cells for a biopsy, which he said will take around 3 weeks.
I think that they send the cells, if they need to remove them, for a biopsy to be safe but the doctor told me that around 90-95% of women who have the treatment fully recover and there will be no further progression.
Try not to worry, I know that feeling of panic very well but they have caught them early and will act quickly if you do need treatment.
I had this hun and had the lletz treatment (30th October) results came back as high grade abnormal cells but no cancer. I have to go for another colposcopy again in 6 months to check and for a repeat smear. I was told at the colposcopy appointment that sometimes high grade dyskaryosis can already have turned to cancer but it is unlikely. Try not to worry, easier said than done, I know I was terrified. Normally they will do the treatment there and then to sort the problem x