Hello, I am 25 years old. I have a hard immovable lump behind my left ear equalling to the size of a golf ball. I have extreme short term memory loss and tingling of the nose, feet, and hands at times, also migraines that no medicine seems to work on. I m very irritable, and very short tempered. Some blacking out and light headed as well. Does this sound like a tumor or could it just be like a swollen lymph node?