i suffer from mirgaines ever since i had meningitis and a 2nd infection of Encephalitis 2 yrs ago, im on tablets to control my headaches as they wake me up from sleeping, i suffer with ringing in my ears, i have to waer glasses as i went partially blind due the swelling at the backs of my eyes, my right arm n leg some times goes numb still too as i lost the feeling in them when i was ill and for the last 2 wks i have a pain on the left side of the back of my head, its a small lump near the boney part of your lower head thats tender to touch it,even laying on that side hurts. i havent fallen or knocked my head. what can it be?