What..is this?

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For about a year now, I've been progressively losing my hair and I'm really not sure as to why. At first it was just my scalp then it became apparent across the rest of my body. It seems to happen diffusely in a pretty rapid manner. Like one day theirs hair their, the next their isn't. I tried finasteride, roagaine and nizoral to no effect..just continued on at its normal pace. Had a scalp biopsy and blood work done and nothing has come back abnormal just doctors have been of no help. Does anyone have even the slightest clue what might be causing this?