Well unless you want to wear a wig, which I'm sure you don't... there are 2 options left:
1. There is surgeon technique invented several years ago, basicly planting hair and hair follicles... Doesn't look to great and is a bit expensive. Might be worth a look though.
2. This option requires more discipline and more effort. You have to contruct your cells and repair the damage done by the chemotherapy. It CAN be done, it just can take up to 3 years depending how disciplined you are. I'm not sure though how well/fast your hair is going to grow back. It really depends on the person's genes.
I can however tell you this is the best choice, not only for you hair but for your health in general. There is a free book available online; it will answer all your questions and help you rebuild your original health and prevent cancer from re-occuring. Here is the link :
http://www.jonbarron.org/book/book-sign-up.php