Painful Shoulder And Neck. Why Do I Get Dizzy And Lightheaded?

It started a year about almost exactly, the right side of my neck and shoulder became painful. I shrugged it off and thought of it as stress . For months now, I get dizzy, lightheaded, shaky, black out, the pain in my neck and shoulder has become worse and more frequent, it s been swelling like an odd lump, and bruises form there out of the blue, when no contact has hit my neck. Im always tired with no real reason as to why. I have no medical insurance and I m worried. I have no idea what could be going on.