Oh sweetie, so sorry this is happening. (((hugs)))
I got sort of sick a couple of years ago and dropped quite a bit of weight. Mostly due to stress, but I lost a huge clump of hair from the side of my head. It was awful, just this huge bald spot, about 5 inches around right on the side. Nothing I could do to hide it except wear a hat or scarf. Mine did come back, it just took some time. The worst part was growing it back in to the same length. I'm sure yours will come back, and I agree with the prenatal vits. They may help quite a bit. My hair and nails always went crazy when i was on them.