Hi
Welcome to the MedHelp forum!
This could be a case of occipital neuralgia. This usually happens due to spinal nerve compression because of overuse of computers, work involving straining of neck, herniated disc, canal stenosis, bone disease, spondylosis, poor posture. You should have a MRI focusing only on C1-3 and also look at C1-2 instability.
A stiff neck due to muscle contraction can also cause occipital headaches. These can be treated with occipital nerve blocks.
Hope this helps. Do discuss this with your doctor (a neurologist) and get yourself examined. Please let me know if there is any thing else and do keep me posted. Take care!
With what I have read over the years, and due to the fact that one of my husbands died of an of a vein rupture, and another had ruptured veins in his neck; I supect a tumor, at the least. If you smoke, or do any other drugs, this would only increase the likelyhood of the lump just going away. Go to the doctor, get it checked out, again!
hmmmm get a second opinion...