Swollen Gland on the Right Side of my Neck?

So a few days ago I had a slight pain in my upper neck almost directly below my earlobe. I just figured that i may have slept on it wrong. But today for some reason, after i was done mowing several dwarfs, i went to my girlfriend's sister's house and the pain was increased. I also thought this was normal as i was chewing on gum all day today so i thought my jaw was sore. But when i got home a couple hours later i was playing PS3 and reached up to my neck and now there is a big swollen spot which feels almost like a basketball in my upper neck/jaw. I also started feeling feverish and my stomach was not feeling so good, but those symptoms are over but the swelling has yet to subside or change. What could this be and should i contact my doctor? Im keeping ice on it and rubbed menthol over it to see if it broke down.