Risk of HIV or any STD by oral ?

[Jakeconcerned]

Okay so I had a m2m oral session with a random guy about 1month ago just cause of curiously and he told me he didn't have any diseases but I still have doubts. I only performed oral on him for not even a minute maybe 30seconds then I stopped cause I realized that it wasn't my thing. But now I'm afraid and have so much anxiety that I might have some type of STD or HIV. On week 2 I was very afraid because I was coughing and had cogestión real bad but everyone living with me was sick also but righht now I'm better just a little cogestión now. Could they have caught whatever I caught if I didn't get something from oral sex? Then on week 3 I noticed my corona of my penis is redish but it doesn't hurt or itch sometimes I feel like it hurts but I might be paranoid because I started feeling like it hurted after I saw it. Can this be from oral sex I gave? Or maybe cause I'm uncut? Honestly I've never checked out my penis very well so can this just be my normal skin color? I'm very afraid to even get tested. Although I am a cancer patient and just 2days ago my doctor said my blood counts are good even better than he expected. Is that sigh of no infection?  If I would have caught herpes I would have been covered wth them by now right ? I've been real depressed and anxiety has been killing me even thought the guy said he was totally clean and even got mad at me for asking him so much ... please help