Very very dizzy and faint 33+3

Anyone else ever felt super dizzy all day?? I have occasionally had dizzy spells but they normally only last about 30 seconds but today have felt dizzy all day! I keep walking into walls I’m so faint. Apparently my blood pressure and iron levels are normal and I’m definitely eating enough. My work are not amused as I’ve had to call in sick I feel like my colleagues are getting annoyed at me but I literally can’t see straight 😩 anyone else had anything similar to this??