I'm not a doctor, but that looks like some irritation, maybe.
Herpes is blisters. I don't know if that guy has herpes (his tests say no, but I didn't read the whole thing), but it's not herpes in his urethra.
I'm not a man, so I haven't personally experienced this, but it is my understanding that having herpes sores in the urethra is PAINFUL. Urinating with them HURTS. It leaves no question that something is wrong.
If you have symptoms, you won't need to spread your urethra to find them. Stop doing that. All it does is cause irritation.
Your encounter was protected. The chances of you getting herpes are very, very slim, as I told you before.
Is this anxiety normal for you? Is it because it was a CSW? If this is normal for you, you should consider talking to someone about it. It's not in proportion to the risk level here.