I am feeling dizzy on switching side while sleeping from 2 days, i am normal she i am in standing or moving position but not while sleeping.

Professional Assessment: The positional dizziness primarily during sleep position changes suggests benign paroxysmal positional vertigo (BPPV) as the leading diagnosis, though cervicogenic dizziness and vestibular neuritis should also be considered in the differential for a 21-year-old female. The pathophysiological mechanism likely involves displaced otoconia in the semicircular canals (particularly the posterior canal), which is less common but still possible in young adults, or potential cervical proprioception disruption affecting vestibular function. Given the patient's young age and female gender, additional considerations should include migraine-associated vertigo, anxiety-related dizziness, and the remote possibility of Multiple Sclerosis, though the isolated positional nature of symptoms makes these less likely. Further evaluation should include the Dix-Hallpike test, detailed neurological examination, and potentially vestibular function testing if symptoms persist or worsen, with particular attention to ruling out more serious central causes given the patient's young age.

Try sleeping with your head slightly elevated using an extra pillow and make slow, gradual movements when changing positions in bed to help reduce positional vertigo symptoms. Take over-the-counter antihistamines like Meclizine (Antivert) 25mg before bedtime which can help reduce dizziness and vertigo sensations. Ensure you're well-hydrated throughout the day and avoid looking at screens right before bedtime as this can sometimes worsen positional dizziness. For additional treatment recommendations, ask in the chat.