To fight against a virus or any other disease you have indeed to use your brain, to recognize the symptoms, to accept them as a signal, but not to focus on them, they have done their job, it is up to us to do ours by taking care of ourselves and continuing to live.
You said it perfectly. The symptoms of an illness are a signal to stop and rest. Sometimes it takes a little mental engergy to come to terms with it - both to not try to do normal activity and to not feel guilty not doing normal activity. :-)
!ALIVE
!CTP