This makes no sense.

Like I've said before, my hair, eyebrows, and eyelashes fell out.. my eyebrows and eyelashes haven't at all grown back, but my hair grows back almost as soon as it's gone.. as if it's shaved, but it isn't. Not that I'm really complaining. I'm glad it's growing back as fast as it's gone, but I've never heard of that happening. I haven't been able to get back to the doctor, and of course the ER has no clue.. he thinks I shaved my head. Why would someone do that? Not that I would except any less accusations from the ER at this point.. They never help anyway.. but does anyone have any clue as to why it's doing that? My hair is also so brittle.. it breaks off, everywhere.. close to the scalp and otherwise.. I did cut my hair off short, and donated my hair to help prevent some of the breakage... but it just looks like someone came after me with a weedwhacker.

Sounds like one of several possibilities, or a combination:

1) Medication side-effect.  Hair loss can be a side-effect of many medications, including immunosuppressants such as Imuran, Azathioprine, Methotrexate, etc., and also Prednisone.

2) Nutritional deficiency.  B-Complex, Silica, Protein (amino acids), Vitamin E, and other nutrients are required for healthy hair, skin & nails.  If you are deficient in one or more of these nutrients, the body won't have the raw materials needed to grow strong and healthy skin/hair/nails.  Additionally, Vitamin B12 deficiency can cause complete loss of hair (including eyebrows).  If I were you, I'd get tested for B12 deficiency.  Also, Biotin can help offset hairloss caused by a variety of factors, including medication side-effects.

3) Stress.  This goes along with point 2 above, since nutritional deficiencies both cause stress on the body, and also can be caused by stress.  A daily multivitamin/multimineral supplement may be helpful.

4) Autoimmune hair loss - Alopecia Areata & others.  Inflammatory activity that affects hair follicles may lead to hair loss and/or poorly formed (unhealthy) hair.

Have you tried hot oil treatments on your hair?  I have very dry/brittle hair and was told that hot oil treatments periodically would be very helpful.  I've had a couple and they do help some for a while.  Also, if you dye or perm your hair, or use a lot of styling products, that may be partly to blame because these chemicals can damage the hair and/or follicles and may be contributory to the problem.

I hope this helps - take care,