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Things that can cause tinnitis are exposure to very loud noise... like standing in front of an apm for band practice every night...or sitting in the front section for multiple rock concerts.. or operaing LOUD machinery... toxic levels of vitamins, aspirin etc...
It is VERY unlikely that this is permanant in your case. It began abruptly, which is suggestive of inflammation, probably due to water in the ear.. ( shower) of infection (?)
Tinnitis does no tlead to hearing loss, but can be a symptom of hearing loss. I really think you should go to an Ear, Nose Throat Doctor who will use a scope with a light and look into your ears , he will also be able to easily and painless remove wax ( which I bet it is) and provide antibiotics if needed. Try not to worry.... I honestly think you have a completely curable situation.