Hi rubylady, I had borderline changes three or four times. I can't remember what happened at the follow ups (this was nearly 40 years ago!), so it certainly never developed into anything else.
Many, many women carry the HPV virus, without any side effects, so please don't worry about it- unless you're planning to get pregnant!
We usually get Vit D from sunshine.....sadly lacking in this country at the mo', and necessary for bone strength amongst other things. The best immune support/enhancer is a healthy diet and a multivitamin, please don't go wasting your money on Chinese mushrooms or other possibly dubious 'cures'.
I'm sure you'll be fine, things have been picked up very, very early.
((Hugs)) x