Hello I Have Been Feeling Nauseated And Dizzy A Lot

Hello I have been feeling nauseated and dizzy a lot lately. im not sure if its a cause of the pain I feel due to a herniated disc I have in my back. im seeing a specialist tomorrow for that but these dizzy spells and nauseous feelings come and go and its super frustrating. im not pregnant so I don't know what else it could be. do you have any different ideas as to what it could be?