Hi, I am a 27 year old healthy, very active girl. I've been sick on and off for the past month. Last week I was diagnosed with a bad sinus infection. I had a mild fever, aches, chills, pain and pressure in my sinuses, bad congestion, and a bad cough. I was put on prednisone and clarithromycin. My sinus symptoms cleared up, but I still don't feel a whole lot better. Also my boyfriend who I live with was just diagnosed with the flu three days ago.
I finally returned to work yesterday waitressing and began to experience a lot of soreness and pain in my right armpit. It hurts to raise my arm above 90 degrees and hurts to carry anything. There is no muscle trama, and I am a dancer-so I know the difference between sore muscles from overwork. This feels like my lymphnode is very swollen? I figure this is just a side effect of being sick, but I am concerned since it is just one arm, and also because I have never had it be so bad that it hurt to raise my arm.

I really can't afford to go to the doctor again, especially if this is just a swollen gland that will go down eventually. Can you please tell me if there is something more serious that I am missing? I will go to the doctor if i have to- but only if it's a really good reason why I should go. Or can you tell me further symptoms I should watch for in the next two days to indicate something more serious than a swollen gland? Thank you! I hope you have a good day.