What Causes Painful Lump In Neck?

Hi, I ve had an under the surface lump in my neck for about 7 years now. I went to a doctor when it first appeared and he told me not to worry about it unless it got bigger, then to go back to a doctor to get tests done. So, I just figured since he didn t think it was anything to worry about it wouldn t be anything.. Anyways, I m 20 now and it has grown a significant amount since i ve seen that doctor but I didn t think anything of it until now. It s been hurting on and off for a few months now and sometimes feels like it s blocking my ability to breathe. I ve also started getting a spotanteous, tense pain the in the base of my skull at the back of my neck. As well, If I star at something for a while the object starts to shake. I ve also had a bruise on my shin for about 4 years now that just wont go away. I m not sure if any of these things are connected but if you could help me with any or all of these issues I would greatly appreciate it. I m not the type of person who really likes to go to the doctor as I feel like i m just wasteing their time.. But these things are really starting to worry me and I don t want to be worrying over nothing. Thank you so so much. Samantha