Trying to grow hair out from Chin length

OK, I have hair that's about an inch below my chin and I'm getting married in May so I really need to grow it out so that I can have a great updo! (Last year, my hair was long (for me) about half way down my back, but it took me over 2 years to grow to that length with normal trims). These forums have really helped me out in the past, so I thought I would see if anyone had any good suggestions. My hair is straight and fine, and it grows REALLY slow. I've been reading some stuff about Viviscal, but it's sooo expensive that I would only be able to afford to use it for a couple months, and I'm always worried about the potential side effects of taking stuff like that.  Does anyone have any comments about the vitamin if you only take it for a couple months and then quit? Also, I don't like to go without having my hair trimmed for longer than a couple of months. Is it possible to get only 1/8 of an inch cut off or is that too little? Since my hair grows so slow, I'm worried that any more would defeat the purpose of even trying to grow it out! Basically, ANY advice on growing my hair out would be great.

Thanks so much! You guys are great!

~Abs

Great, I'm already behind =) My hair is highlighted, colored and must be blow dried for work--- and patience is not one of my virtues! Oh well, maybe extensions or clip on would work!

THANKS for the advice! Maybe some extra multi vitamins will do the trick although I'm still researching Viviscal.

~Abs