My oldest son is a healthcare worker and recently got his second COVID Vaccine shot. He told me he felt tired for a day or two after getting the shot. He feels fine now. Yesterday Dr. Amanda Cohn of the C.D.C.'s National Center for Immunization and Respiratory Diseases said there are actually three common vaccine side effects. One of them is fatigue just like my son had. The other two are pain and a low grade fever. Dr. Cohn went on to say the side effects are "expected and should resolve in a day or two." She also said it's not COVID. "It's your body building an immune response to the protein mimicking the disease."
Source: New York Post