Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have symptoms of flu, backache, cough which is leading to stomach cramps and arm ache which are pointing towards upper respiratory tract infection leading to common cold, which can be caused by bacterial or viral infection. You should do warm saline gargles and drink one spoon of honey mix with glass of lukewarm water. I would suggest you to consult ENT specialist for proper examination. Doctor may order test like viral culture test , throat swab test and blood test to confirm the diagnosis and rule out causes. Doctor may prescribe anti bacterial amoxicillin or anti viral acyclovir depending upon the diagnosis along with decongestants. You should take steam inhalation along with vaporizers. Avoid hot, sharp , spicy food. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari