freewillie
Contributor
After re-reading first post it seems like your GF had sx prior to getting in the water before her first dive. If her persistent nausea and vertigo started prior to the first dive IMO makes DCI less likely. At that point you are looking at either benign positional vertigo or labrynthitis which is an irritation of the semicircular canals in the inner ear. Either condition can persist for days if not weeks and cause vertigo with associated nausea. If ER vist ruled out more serious condition such as stroke and sx did not improve with therapy in decompression chamber likely dealing with either of previous two conditions.