Can u have a virus (covid, flu) and only have muscle aches and fatigue? had both shots n booster. and flu shot. but over last 24 hrs. had bad muscle aches and pains and some fatigue. no cough or cold symptoms?

Many viral infections can produce the symptoms you described. It is good that you are vaccinated. However, almost no vaccine is 100% and subclinical infection with one of the viruses you are vaccinated against could produce the symptoms. Stay hydrated, take acetaminophen for aches, no more than 4 g in one day and no alcohol.

Since you are vaccinated to both infections, you most likely had a more mild course if the illness is COVID or Influenza. Treat symptoms, stay well hydrated and monitor temperature and breathing. Watch for shortness of breath, chest pain and fever. Test for COVID 19 regardless, since mild cases are still associated with transfer of the virus to others. Stay self isolated and please obtain testing