What Causes Discomfort And Fluid Discharge From Left Ear After A Surgery?

HI my name is Beth Shortt I had surgery on the left ear due to a severe infection that lead to an abcess lesion on my brain in the back left of my head. The ENT I seen in Charolettsville VA said he had put a sponge like object over the mastatoid bone behind my left ear to capture the infection and keep it from causing farther problems and removed the lesion. This was a little over 4 years ago. Now for the past 2 years I have had severe pressure in my left ear on that bone and it seems to continue to the back left side of my head. Also drains a clear fluid at times. Dizziness occurs while leaning over to pick things up and when I lay down to sleep the pressure is the worst and cause my face to tingle or feel numb. I have been to ER over this issue and all they do is check vital signs and look in my ear with a light and send me home. I am truly concerned if maybe the sponge-like object that was inserted in the mastitoid bone is causing my issue or perhaps settting up a worse infection? Please help me!!