How can I form a diet that is best for me?

I currently weigh about 172-173. I am looking to weigh about 160-164. I am a boxer, which is why I am trying to make this weight cut. I do not want to lose water weight for a fight, I want to lose body weight. I have been having a big problem since I've started dieting. I started out weighing around 180-185, but this 8-10 pound weight loss has been very stressful. Mainly for the fact that I can see my hair falling out. That is my biggst concern. I want to be able to make my ideal weight, but do it so that I am not hurting my body. What can I be able to do to lose another 10 pounds, but still be very healthy?