I wish I could remember exactly, but as I wrote earlier, I was told by a GP a few years back that there's another operation that can be performed that's less risky than grommets..??? Could it be the gruesome-looking procedure where they rebore the sinus passages? From what I understand, it's one of those operations that looks ghastly, but isn't too risky.
If you read reports on the 'web, it appears that grommets rarely work, and have a large risk of permanent hearing damage as they involve making a hole in the eardrum. I know that grommets would be the last port of call for me.
For what it'll cost you, and for what my opinion (and those of others in this thread) is worth, I would be inclined to visit a Physio for a few sessions to make sure your posture is good, particularly if you spend a lot of time behind a desk / computer.