It is very common for the heart rate to increase when the body is fighting a fever; the heart naturally beats faster to help pump blood. Since his oxygen levels are normal and he has no other symptoms, this is likely a normal physiological response. Please ensure he gets plenty of rest and stays well-hydrated. You can continue giving paracetamol (Crocin) to manage the fever as directed. However, if his heart rate remains elevated even after his temperature returns to normal, or if he develops shortness of breath, chest discomfort, or extreme fatigue, please seek medical attention.

Given your fever, severe headache, and recent red eye, we should consider a few possibilities since your dengue test was negative. These symptoms, especially when not responding to standard antibiotics, could point towards certain viral infections like adenovirus, or other infections such as leptospirosis or rickettsial diseases, which can cause eye redness and headaches. I strongly recommend visiting your doctor promptly for specific blood tests to get an accurate diagnosis. Please stay well-hydrated, rest, and use paracetamol for comfort while seeking an in-person evaluation.

Because your left-sided chest pain is spreading to your shoulder, neck, and back, and has not improved after taking paracetamol (Crocin), it is very important to seek immediate medical attention. Please call emergency services or have someone take you to the nearest hospital emergency room right away. Do not drive yourself. While you wait for help, please sit or lie down in a comfortable position and rest.

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You should stop taking both Combiflam and Crocin immediately. A widespread, itchy rash can be an allergic reaction to these medications, which contain ibuprofen and paracetamol. Please seek immediate medical attention from a doctor or visit the nearest clinic so they can safely evaluate the rash and provide you with an antihistamine to help soothe the itching. Avoid taking any more of these medicines or similar pain relievers for now. Keep your skin cool, avoid scratching, and rest.

I understand how frustrating it is to deal with a stubborn high fever and headache, especially when paracetamol (Crocin) isn't bringing relief. At your age, an acute fever with a posterior headache could stem from a severe viral infection, a sinus issue, or occasionally, a more serious infection requiring specific medical treatment. Because these symptoms are persistent and not responding to home care, it is very important to see a doctor promptly for a proper physical exam.