Question about x-ray

I recently had an x-ray of my chest. Well the doc's office called and said you need a ct-scan asap because they found a mass in the left side and we need to find out what is going on. Now I'm not stupid, I'm a retired EMT (25years of it) and I was with my father-in-law from the time he found out until he passed. I also have a cough that I can't get rid of, my husband says but you have been sick. I think my husband has an idea of what it might be because his father had the cough and he is just grasping at straws. I beat cancer 4 times, I am not ready for this. I also have lupus. Any info would help, thank you.