Thank you for your query.
i do understand you anxiety
is a disease that causes myalgia
and severe weakness.Along with that you child has lost some electrolytes during vomiting
.All these factors are making your child weak and that is why he cannot walk.
Give him rest,lots of rehydrating fluids and nutritious food.Give him some time to recover.
Hope this answers your query.
If you have any other queries kindly direct them to me.
Wishing a speedy recovery.
Have a nice day.