Stimulus sensitive seizures.

Hello, My dog is part pomerainean and part something else. He is about 25lbs. He is also 16+ years old. He is starting to show his aging more and more. He has some hip displacment , getting cateracts i believe he also cant hear very well. For the last year or so he seems at times to have trouble keeping his balance and walking a straight line. Like he is being pulled to one side. All that being said the main reason i am contacting you is this. About a year ago i was playing my electric guitar kinda loud and all of the sudden rambo started freaking out. He was barking wildly and flopping around on the ground. His heart was beating very hard and fast also. I took him to the emergency vet and they told me he probably had a siezure and to just watch him. Then about 3 months ago while my wife was running the vacume he had another episode like the first one. These siezures or what ever they are last around 45 minutes from start to finish . Then today i was outside cutting a piece of wood with a skillsaw and boom, he went into another episode. Running around barking wildly , running into things, flopping around on the floor. He actually cut his lip open this time because he was banging his head on the wall before i could get to him. Its becomming very apparent to me now that these seizures are being brought on because of loud noises. Wich is a little wierd because as i said he is almost deaf. He has not had such an episode without there being a loud noise first. He almost never barks normally either. Does that seem possible to you that loud noises could trigger these episodes? Also i am wondering if maybe this could also be connected some how to his equilibrium problem. Like maybe he might have an ear infection and the loud noise maybe hurts his ear so much it causes a siezure? Obviously you would probably wonder why i dont just take him to the vet to check. When i took him to the emergency vet i mentioned that possibility to him and he said he did not see an ear infection. But it didnt seem to me that he really checked his ear that closely for the $250 he charged me. I just want to know another opinion. Right now i am not working so my money is kinda tight. Thats not to say i cant come up with a little for the vet.. So tell me what you think...Thanks

Just 1 more quick question , about his problem with his eqilibiam , could that be caused by an ear infection?