Benign Paroxysmal Positional Vertigo (BPPV): This condition is characterized by brief, episodic vertigo triggered by head movements, which could be described as a floating sensation. Tinnitus can sometimes accompany vertigo in BPPV, although it's more commonly associated with other symptoms.

Meniere's Disease: A disorder of the inner ear that affects balance and hearing, causing vertigo, tinnitus, hearing loss, and ear fullness. The floating sensation could be a description of the vertigo experienced by patients.
Vestibular Migraine: Migraines can cause vertigo and tinnitus, among other symptoms like headache and sensitivity to light and sound. The floating sensation might be a subjective interpretation of the vertigo associated with these migraines.
Labyrinthitis: An inner ear disorder characterized by inflammation of the labyrinth, which can cause vertigo, tinnitus, and hearing loss. The symptoms could align with a floating sensation in the head and tinnitus.

Stroke or Transient Ischemic Attack (TIA): Although less common, vertigo and tinnitus can be symptoms of a stroke or TIA, especially if accompanied by other neurological deficits. It's crucial to rule out these conditions due to their high morbidity and mortality.
Multiple Sclerosis: This autoimmune disease can cause a wide range of neurological symptoms, including vertigo and tinnitus, due to demyelination in the central nervous system.
Acoustic Neuroma: A benign tumor on the nerve connecting the inner ear to the brain, which can cause tinnitus, hearing loss, and balance problems. While rare, it's a significant diagnosis not to miss due to its potential impact on hearing and neurological function.

Chiari Malformation: A structural defect in the cerebellum that controls balance, which can cause vertigo and tinnitus among other symptoms. It's a rare condition but one that could explain the combination of symptoms.
Superior Semicircular Canal Dehiscence: A rare condition of the inner ear where there is an abnormal opening in the bone overlying the superior semicircular canal, leading to vertigo and hearing symptoms, including autophony and sound-induced vertigo.