"Sound" advice from happyolddog. Otitis media can cause substantial but transient hearing loss, and recurrant otitis media can lead to learning, speech and language problems.
When you next talk to your ENT consultant, think about the questions you want to ask him beforehand and ask him to explain the disease process invloved, and wether it is one infection or a series of recurrant infections. You might also want to ask him about your concerns regarding the ear drum, and perhaps the ossicles in the middle ear. Voice your concerns about any possible permanent damage.
ENT nurses can also be a fountain of knowledge.
NHS Direct has information about "glue ear" here:
NHS Direct - Health encyclopaedia -Glue ear