The other person is a stranger and I am not sure whether he has HIV. When I had oral sex with him, I found blood in his mouth and his blood on my penis.
Is it possible for me to be infected with HIV like this?
Oral sex, even with blood, is not a risk for HIV. Here are the ONLY risks for HIV transmission: Having unprotected vaginal or anal sex or sharing IV needles to inject drugs. Air and saliva inactivate the virus. So, oral sex is not a risk. Even with blood. You don't need to worry or test.
Unless you have unprotected vaginal or anal sex or share needles to inject drugs, you don't have to worry about HIV. And already stated, some blood in their mouth that gets on your penis willl NOT transmit HIV. No one in the history of HIV has gotten it that way and you will not be the first.
Nope, you are reading junk on the internet. There are no proven, documented cases of oral from oral sex. You had NO risk. The answer to this won't change. We receive guidance by experts in HIV for this forum and oral is not a risk beyond theoretical and NO ONE has ever gotten it from HIV. It would be big news. People can claim what they want but it's not substantiated by science or evidence that is tracked.
7 people in the US get bubonic plague every year; the latest one was from their cat. Are you afraid of a cat giving you plague - no. You don't test for plague every day even though there is an ACTUAL chance you can get it, so your priorities are mixed up when you worry about getting infected from oral which has never happened in 40 years of hiv history - and won't happen in the next 40 of your life either.
There's no such thing as a "special case." The methods of HIV transmission are well-known and have been well-documented over the past 50 years. HIV is not going to start magically transmitting by receiving oral sex.
Your ideas are quite silly, that you are some special case that the world hasn't seen before in the 40 years of hiv history. It is time to move on from this non-event. See a mental health therapist if you are unable to think logically about this non-event.