I think i have thrush or a yeast infection, do i need to see a doctor?

Vaginal yeast: Assuming you're referring to a vaginal infection: If your symptoms are typical (itching and irritation more than discharge, not much odor), try a vaginal cream or insert with active ingredient ending in "azole" (clotrimazole, miconazole, and several others); a pharmacist can help. They all work well; you can use the least expensive. If your symptoms don't clear up in a few days, see a doctor.