Why am i still experiencing allergies if using flonase and benadryl (diphenhydramine)?

See ENT/allergist: You may be more sensitive to allergens than others or the combinations of medications you are using is not the right selection for you. Worst case scenario is that your perceived allergy symptoms may be something else entirely. You may need to see a specialist for skin testing (and blood work) to various allergens in order to achieve a better management plan.