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Ear infections are difficult to treat, since there is not as much blood supply as in some other parts, and it is surrounded by bone. There is no way to say if it will clear on its own or not. If you are having significant symptoms, odds are that it will not. However, there is no way to predict for sure.
For the vast majority of patients there is no increased risk of sudden cardiac death. It is people with pre-existing serious health conditions such as diabetes, heart beat irregularities, or a previous heart attack who may have a higher risk.
If you are still afraid to take it, you should contact your physician who can prescribe a different antibiotic such as amoxicillin.
That's a shame. A macrolide like azithromycin would be a god choice in the case of your other allergies.
If you have no other contraindications you can try an over-the-counter decongestant like generic Sudafed. It's my "go-to" for minor stuffiness of the nose or ears. I tend to use the low dose, every 4-hour product, because many patients (including myself!) get a feeling of nervousness or jitterness when taking the stronger 12-hour variety. You will know within the first day if it's helping or not. Be sure to drink plenty of water along with it.
You're so very welcome! Good luck with that ear, and happy new year.