Anyone taking antimalarial drugs to prevent malaria who develops a fever or flu-like symptoms while taking the medicine or within 2-3 months after traveling to an area where malaria is common should call a physician immediately.
Treatment of knee pain depends on the cause of the knee pain. If you have been working on your knees all day then potentially rest and anti-inflammatories such as ibuprofen can help. If the cause is trauma and there is possible joint damage then you should seek medical attention.
Knee pain is a fairly common condition. Knee braces are a type of orthotic (a device used to help the body function normally) that is often helpful -- although not for all knee problems. If you have a knee problem, it warrants seeing your primary care doctor.