We were on vacation till recently. After coming back my lo had fever cold and cough. Medication are on however she has become weak and not able to stand up and run or walk like before due to weakness as she's not taking food properly. Some kind of rashes are visible on her skin. She likes to just lie down in bed and not play or become active as before. I feel like crying. Please help.

I suggest you meet the doctor again as your lil one is having rashes too. Doctor might look for symptoms and help you with some other medication.