I have an enlarged lymph node near my jaw. i have earaches and i also feel pain in my legs, arms, feet, and hands. could it be hiv or some other dise?

Get tested: If you have high risk sexual behavior or use IV illicit drugs, get tested. Don't wait for symptoms because you might not have them until really late. Only one lymph node is not very dangerous but i would have a consultation with the physician to be on the safe side.

You have alot: Going on so instead of speculating what you may or may not have a complete history. Physical and bloodwork is in order with an internist.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.