I have a hard painful lump just behind my ear by the hairline. it's rock hard,tender,i also have headaches, dizziness, and a ringing in my ear.

See Your Dr: Assuming lump, headaches, ear-ringing and dizziness started more or less together or w/in a short period of time (as opposed to say, you had headaches or dizziness for years which now worsened), I would see your doctor without delay. These could be serious. They could also be related to a musculo-skeletal condition. A doctor will need to see and examine you to help.