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Based on the series of normal tests you've had thus far, it's not very likely that you'd be admitted to the hospital based on an initial visit. At this point you have no reason to suspect you'd be admitted at all.
Have you had an MRI, do you have hearing loss, did the doctors suggest a possible cause?
Here's a page that discusses the complexities of diagnosing ear pain. When you read it, there are a few more serious causes and many non-serious causes. Since you've been seen by a doctor and received tests, your doctor has likely ruled-out the more serious causes, don't dwell on them.www.aafp.org/afp/2008/0301/p621.html