Hi thanks for posting here, I understand your worry Brief answer: Treatment depends on the cause for pain Detailed answer: Before starting treatment like pain killers (analgesics) it s important to identify exact cause for left sided chest pain. There are several reasons for left sided chest pain. because you describe a pain in the rib cage and also history of fever, costochondritis with or without Pleuritis is a main possibility. Costochondritis occurs when the costosternal joint, the joint where the ribs connect to the sternum, becomes inflamed. This localized, sharp left chest pain is most commonly experienced by teenagers or young adults. This left side chest pain can be caused by viral infections and can worsen after activity. Because you give a history of fever this is likely. It can be treated with physiotherapy and anti-inflammatory medications. Other causes for left chest pain are Heart attacks (cardiac ischemia), Intercostal neuralgia, acidity, gas and heartburn. because you have nausea it may be due to gastritis. Acid buildup, gas, and heartburn can cause mild to severe pain in the left side of your chest. These all develop in your intestines and move to the chest area. When the pressure pushes against the wall, you feel the pain. You may experience bloating, flatulence, and abdominal pain alongside the left chest pain. You should not ignore this pain as it is very similar to that of a heart attack. It is important to receive proper diagnosis from your doctor. But dizzines may refelcet poor cardiac function as well. Please Never make your own diagnosis, as left side chest pain may be the symptom of a more severe medical condition mentioned above. Therefore before starting treatment it s important to identify exact cause for fever and chest pain. Thank you.