Hi, I have something under the skin in my neck (does not feel like a lump, more like a muscle/tendon/joint or something like that). It is not visible, and only hurts when I consistently apply pressure to it. I am only 20 yrs old, female. I don t feel it on the other side. I think my body is fighting off sickness as well, I threw up earlier and I slept for almost 16 hrs. Any ideas?