I've been trying to resolve my own middle ear problems for three weeks now. From what I have read on the internet it can be a rupture because of the pressure. It also says that it will heal on its own. Don't know about that--I would still be concerned. Glad to hear you have at least seen an ENT. Keep bugging them. Go to the ENT again. Your hearing is something to protect. Can't believe you have lived for a whole year with this problem. The "underwater" feeling is driving me crazy and I've only lived with it since a severe cold happened 4 weeks ago. I hope you find some relief soon.