Don't worry. It's not going to harm much. But, you may have a dizzy feeling in 24 hours due to double the dose. Be careful, do not get up suddenly from sitting position without a support to avoid dizziness in case there is low BP. Apart from this, you may feel little listless or less energetic. That's it. In case of any other unusual symptom, report to hospital.
Next Steps
Relax and take adequate nutrition.
Health Tips
Don't panic. Use support in case feeling dizzy.