So, you do sound like a person who worries a lot. And when we worry a lot, we feel things 'more'. Perhaps the action was a bit to rough and caused some swelling, bruising of your penis. But oral was protected both times. This sounds about as safe as you can get. Nothing usually starts immediately std wise. And you do not sound to have been at risk of any to me. So, I would give it time and try not to think about it as your thinking about it a lot may be making you feel pain that might go away otherwise. And a trip to the doctor never hurts.