We have had ear troubles too and our ENT said DD's ears were so bad that she had at least 40% hearing loss with her glue ear. We went on a dairy free diet about 8wks ago and she is almost completely cured! We have to continue with the dairy free for now, our next appt is in 4wks time. I am just happy my baby doesn't need an operation.
So try dairy free before you go the operation route! Much easier and cheaper.