Unlike all the other armchair doctors watching videos, this one came right from Huma discussing her diagnosed condition. And it is probably worse than most of the speculating.
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Cavernous sinus thrombosis
Cavernous sinus thrombosis is a blood clot in an area at the base of the brain that contains a vein, which carries blood from the brain to the heart. This area is called the cavernous sinus.
https://medlineplus.gov/ency/article/001628.htm