Welcome to HCM
We understand your concerns
I went through your problem description. You had been to hospital and the doctors checked you thoroughly and found no abnormalities. That is heartening. Very good sign. Fatigue
and General malaise
is normally the outcomes of low hemoglobin
or general low nutritious food. These could have detected by the doctors.
There is another angle to this. Some psychic vibrations do create fatigue. People love to sit idle and eat. They are unable to do so because of their life compulsions. Idle mind is devil's workshop. I think you have it, idle mind. Do consult a psychologist
and find out.
Hope this clears your doubt. Available for further clarifications.
Good luck. Get well soon.