@horiconmarshgal , As Laurie mentioned it can be difficult to self-refer to an oncologist. Do you have a primary care physician? If not, it is a good idea a to establish care with a primary care doc. While a CT exam is better, even a simple chest X-ray can be helpful in diagnosing any infection, masses or nodules in the lungs. That would be a good first step.
Are you experiencing other symptoms; weight loss, fatigue, pressure in your chest?