Massive Hairloss In a Year

In the past year i've gone from a full head of hair to almost bald all over my head in all spots. I've also lost a ton of hair on my eyebrows, nose, legs, and pubic hair, and it comes out fast. For example, if I run my hand through my hair lightly with only one stroke, 20+ hairs fall out easily. I also have scabs all over my hear, from scalp to bottom of hairline on neck and what seems like a mutant version of dandruff. If it helps, during the course of this year my eyesight has gotten worse, i'm irratible, extremely gassy, almost no attention span, tired often, and have bad face skin, all of which wasn't a problem before. Any help or pointers at all are greatly appreciated. Thanks a jillion!