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Hello from JustAnswer.
You are correct that mild transient symptoms are not typical for an infection. When infections occur, the symptoms tend to be more consistently present. Some infections are milder than others, but even with the mild infections, the mild symptoms typically do not pass quickly.
However, the only way to be able to definitely say that there is no infection is to be checked, so it would be appropriate for you to see your doctor for appropriate testing. The chances are good that the tests will be negative, but that does not mean that you should not be tested.