OMG my hair. Yeah, I was figuring it was related to my surgery.
From a post in a forum (I can't credit it because it was posted by Anonymous. I confirmed this info as accurate through some fact-checking:
"Telogen effluvium" is a term used to describe hair that has been rushed into the resting state after the body suffers a shock due to major surgery. As resources are redirected to help heal the affected surgical area, the body temporarily shuts down hair production because it is not necessary for survival.
Telogen effluvium related to surgery can be distinguished from other forms of hair loss in several ways. Individuals typically begin to notice the increasing hair loss two to three months after the surgery. Hair loss after surgery is uniform, noticeable on the scalp but never excessive enough to cause a patchy appearance or complete baldness.
Hair usually resides in the telogen phase for a period of two to four months before growth resumes. Individuals don't begin to notice the increase in hair loss when showering or brushing the hair until about three months post-surgery. Although the resting hair is being pushed out of the scalp by new hair that is already growing, it can take anywhere from about six months to a year for the hair to return to its normal fullness.
Wonderful. It's been falling like snow.