Had colon cancer and now CEA is rising: Scared

Colon cancer 10 year and now raised CEA
Just had a colonoscopy and it was fine. Went for my yearly check up and CEA is evaluated to 7. no weight loss, no loss of appetite. I am under a great deal of stress, family, marriage lose of a grandchild. Went back to vaping. Doctor is going to do a ct scan. I am scared to death.