I have a swollen lymph node on the right side of my neck and my right tonsil is slightly swollen. right arm keeps going a little numb too. lymphoma?

Possible: It is possible the is lymphoma. However, lymph nodes can be swollen for a multitude of reasons. Most common are typically infections, viral more often than bacterial. Definitely see your physician soon.

Extremely unlikely: The vast majority of times viral illness is the cause of symptoms such as yours. Although everyone panics about cancer, it is actually relatively rare. If your symptoms just started try some Motrin or another antiinflammatory. If it worsens consult with your primary care doctor or an ENT doctor for an evaluation.

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.