I think i may have a yeast infection but not sure about everything. very itchy and thick white stuff .feeling dizzy some stomach upset?

Recommend labwork: I would recommend labwork based on your symptoms. While your description is consistent with a yeast infection, the dizziness could be due to an abnormality in your blood sugar (high blood sugar can predispose you to yeast infections) or low blood pressure or infection. Stomach upset could be a separate issue altogether, but a physical exam would help to determine cause.