Such thoughts can be there during a pandemic of covid ,but having it whole day long which is causing fear and hampering your personal and occupational life is something to be futher evaluated. You need a detailed assessment.
Next Steps
consult a psychiatrist
Health Tips
Do not keep yourself occupied thinking only about the virus and disease.
Daily physical exercise, yoga , meditation will help.
Refrain from listening to news regarding covid 19 or following other information on social media if that troubles you.