What Causes Discomfort In The Ears After A Head Injury?

six months ago I fell and hit the side of my head pretty badly. My head swelled up immediately and I vomited several times.I went to the ER several days later and was told I had a severe concussion.The CT scan showed no problems. I followed up with a PCP for about two weeks at which time I was told everything should be fine in a few weeks.It is six months later and my ear is still not the same as before the fall. A few times a day I experience the sensation of a flutter in my ear,when I swallow I sometimes hear a crackle and it has the sensation of feeling a little clogged.I have seen an audiologist and he said he couldn t see anything wrong and my hearing tested fine.He suggest I see an ENT. What could be causing this?