Hello,
I am having many of these same symptoms. I am a 24 year old male. About 2 weeks ago, I noticed a hard, unmovable, and painless lump on the back of my neck on the right side. Having had infections of lymph nodes before, I went to the doctor expecting an antibiotic like I had on previous visits. However, he told me that since it did not hurt, it was probably not infected. He did blood work on me as a test for Mono, and it too came back negative.
However, since that visit a week ago, I have experienced headaches every single day, most of the time confined to the left side of my head (opposite the lump). Also, I am extremely tired all the time, my skin is itchy, and I broke into an inexplicable rash on my face.
I am realistic, and I realize that I could have worked myself into a psychosumatic illness, but do my symptoms seem to warrant further doctors visits, or should I just wait it out? Thanks for your help, and please, let me know how your doctor's visit goes.