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, redness , cold and headache refer to an Upper respiratory tract
infection which could be sinusitis
or Acidity can cause burning sensation in stomach that presents as heart burn. In some people where it is severe it can cause cough and sore throat
So , redness of throat could be due to both but more due to sinusitis.
Effective treatment of sinusitis could be taking antibiotic course with antihistaminics.Steam inhalation in initial days of cold can prevent worsening into sinusitis.
Gastritis need treatment with antacids.Reducing stress , timing of meals , drinking plenty of water and avoiding spicy foods can prevent and decrease Acidity.