Weakness after Viral fever & infection.

Dear Doctor, My mother were suffering from high fever, cold & cough, we follow the treatment at home due to covid fear of going out. Day 1-2:  Fever & DryCough ---Paracetamol and cough syrup, twice a day "But nothing worked. Day 3: Fever, Shivering, Cough & Body Pain, We called local doctor to start treatment. -- Supra+, Medomol 650, Montina-L , Abupan- DSR, Abuzim-500, Revidox-LB = 3days "But fever couldn't control" Day 5:  Same Condition but No loss of Smell & taste. -- We started "alpha beta arteether injection" for 3 days. Day 8: "No more Fever, Shivering & Body Pain" -- no medication is running #### Now: Having too much weakness, throat dryness, feeling too much sleepy, not eating properly and Yellow vomit with bitter liquid.