I recently went to the doctor because I had lower back pain. She diagnosed the pain as having a bladder infection and gave me an antibiotic to take. As I spoke to her, I asked her to also look at this lump like structure on located at the base of the back of my neck. I thought it was a muscle knot, but after she felt around, she said it could be a swollen lymph node or a cyst or something of that sort. Then, she felt around and near my collarbone, she felt a swollen lymph node and nearly adjacent to the lump on my neck, she felt another. She made me get a blood test just to see if there was anything wrong. I didn't get the results yet. I thought that the swollen lymph nodes might have some correllation to my bladder infection, but after taking the antibiotics, the swelling went down a little, but I still have the lump at the basin of my neck and my glands are still a bit swollen. I am worried at this point. I am finished with my antibiotics, however, they are double strength and supposed to stay in your system. Should I just wait a couple days and see if the lymph nodes go down, or should I contact my doctor?