I understand how distressing sudden scalp burning and hair loss can be, especially while managing IBS, anemia, and thalassemia minor. This painful sensation and rapid shedding are often triggered by intense stress, travel, or underlying iron deficiency, causing a temporary condition called telogen effluvium. Your medications, rifaximin and Librax, are unlikely to be the cause. For rapid relief, try washing with a gentle, fragrance-free shampoo and using cool scalp compresses. Addressing your stress and checking your iron levels with your doctor are crucial first steps. Please see a dermatologist for a personalized evaluation; this is temporary and very manageable.