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I recommend you visit a dietician or a nutritionist so you can have a weight gain program customized for you. Just taking weight gainers without proper advice can cause you some major health hazards. A dietician can recommend you while a nutritionist can help you with the choice of proper supplements for your body type. 

To control body heat and prevent fungal infections in sensitive areas you need to stay hydrated which is very imp., Wear breathable clothes, take cool showers, and use talcum or antifungal powder wherever required. And use antifungal creams if needed.

Possibly you are suffering from a regularly occurring cold. Some of the common symptoms are runny nose, cold, and fever. Your exposure to viruses can bring this about. Get enough sleep, stay hydrated, and consume a well-balanced diet. Also, consider good hygiene so that the virus does not spread. If your symptoms are still not relieved, see a doctor.