Yes In Aug I Broke My Upper Leg In 4

yes in Aug I broke my upper leg in 4 places and in rehab I developed z def that landed me in ICU with organ failure respiratory and a fib . I am female 71 and after 3 months in hospital I finally went home. I use to take Vit C D and B12 but they didn't give me any and said not to start anything else other then the blood pressure med pain med and a blood thinner. I have been home a few weeks and a few days ago I noticed my hair was falling out and not jus a little a hand full at a time . I still can't walk and use wheelchair but the hair loss worries me because Itt is everywhere what would cause this