I starting getting some right back pain on and off recently, and now it developed into a sharp shoulder pain (and sometimes back) with a duller pain in my lower rib. I would be fine and then randomly the pain would start up and then hurt worse if I breathed in deeply or laughed. The shoulder feels like its has pressure along with the pain. It starts to go away and fades to a dull pain, but then fires up again randomly.

Does anyone have an idea from experience or something about what this could be? Thanks!
I am 16
Also, I have had this weird swollen lymph node on my right shoulder, ( i am assuming its a lymph node)
I don't know if they would be connected?