Cold Caps during treatment?

My doctor just informed me that I will have to have chemo. I've already had to go through this ordeal as a child and I'm freaked out. I'm newly married and about to start teaching at the high school level. My self esteem is already so low, and now I may loose my hair, yet again. I'm very worried and emotional about going through this again. My doctor mentioned a Cold Cap, that might keep me from loosing my hair again. Has anyone used one of these? What do you think about them? Were you able to find any financial help to help pay for the expense of these? Any information or advice someone had on Cold Caps would really help.