Hello Welcome to health care magic, I appreciate your concern. Repeated attacks of cold with weakness and dizziness is a matter of concern and it warrants detailed evaluation to find out offending underlying pathology. At the outset I would like further information for better assessment of the condition like Your age, Relevant medical history Have you taken any medicine or ordered any investigation? I would advise you for a battery of investigation like CBC, ESR, liver function test, blood sugar and urine microscopy. Meanwhile have multivitamin and vitamin C supplements. You should do gargling with warm saline water and deep breathing exercises with steam inhalation. Have well balanced diet consisting of all essential nutrients like fresh fruit, vegetables, egg and meat. Have lots of fluids to maintain good hydration. Hope this answers your question please feel free to ask for follow up question I will gladly answer you. Best wishes