As has been expressed several times, this is not an STD concern because there was never a risk for such. We're sorry you are so anxious and hope you are able to work with your own physician to understand.
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Since you've read other posts, you already know what I'm going to say. :)
There is no risk here. I don't know what is causing your discomfort - perhaps anxiety, a heightened awareness of the area because of fear/anxiety, something unrelated - but it's not an STI.
If you feel the need to test for your peace of mind, you can do that now, but it's going to be for peace of mind only - there is absolutely no other reason to test, and no "what if" scenario will change this.