I had sudden hearing loss in r ear, dizzy, sick, num in arm and leg hosp said tia test to follow. can this happen again when waiting for tests?

Depends on cause: Sudden hearing loss, vertigo and nausea are a triad that occur with injury to the auditory nerve/inner ear. It is unlikely to be a TIA which implies blood clot in the brain. Severe sx are generally from injury directy to the nerve - viral infection is often the cause. The arm & leg should not be involved. If they are, TIA is more likely and could recur if not treated. (antiplatelet drugs or surg).