I need to ask few more questions before answering your query. Early consultations can prevent complications. Kindly contact me on whatsapp chat  (84960595 six five) Dr Faisal Zoheb MBBS , MD PAEDIATRICS , PGPN (BOSTON), FELLOWSHIP IN NEONATOLOGY ( Newborn and vaccination specialist )

Greetings Frequent respiratory symptoms often indicate a developing immune system exposed to common environmental germs, seasonal allergies, or an asthma-related condition.Persistent weakness and dizziness, especially when paired with low appetite, are classic indicators of iron-deficiency anemia or nutritional gaps due to repeated illnesses.

At 5 yrs frequent cold Cough and fever are just viral infection as they keep hands here and there they don't wash keep it contact with mouth so they get very easily cough cold fever . Weakness, dizziness and loss of appetite due to Anemia

Consult with Pediatrician physically for further evaluation and treatment

Doing CBC will be helpful as primary step for dizziness and weakness.But encourage small frequent meals instead of regular large meals of two times.Do deworming if history of outside food/water present in recent past

Frequent cold and fever can be common at this age, but weakness, dizziness and poor appetite may sometimes be due to anemia, poor nutrition or recurrent viral infections. Please get her examined once by a pediatrician. Basic tests like CBC/Hb may be needed. Meanwhile give healthy iron-rich diet, good sleep, fluids and avoid unnecessary antibiotics.