Thanks for writing your query.
After reading your post, I would like to mention that fever is usually followed by weakness. This is common after a viral fever
I would like to suggest that you should adequate rest for recovery.
Maintain your hydration. Drink at least 8-10 glasses of water daily.
Also take care of your diet. You should include fresh fruits and vegetables in your diet.
and mineral supplement for few days will be beneficial.
I hope this is helpful to you.