Recently found out I'm severely lactose intolerant but still have been eating some dairy. Have been getting dizzy spells, could this be the cause?

Vertigo, DM. Unfocused vision, feeling imbalanced can be due to (in order of most common): dehydration, infection (virus: though usually have fever) diabetes, other endocrine or autoimmune condition, medication side effects, vertigo, tumor. See your md to be sure there your blood counts are normal and review med side effects with you.