These all r the features of post covid stress and weakness syndrome.
But ur history is very incomplete to prescribe specific medication.
Glucose can provide instant energy but not a permanent solution.
Fell free to consult with detail history like severity of headache, sleep pattern how severe is the weakness
Next Steps
For further clarification, complete evaluation, correct diagnosis and treatment and prescription feel free to consult me on this PRACTO APP. Stay safe and take care of yourself