I've been having dizzy spells for about 6 months or longer...I had a serious fall.?

Need to know what could be causing these?I have them all day everyday, Sometimes not as severe as others.Yeet I can still function..I fell down a flight of 16 stairs and had a bad concussion abd compound fracture..Have had the dizzy spells since.Had a MRI and was okay..Waht else could be the problem?