6 weeks ago, I had an unprotected oral sex (fellatio and cunnilingus) with a young girl with unknown status. My penis have touched the outside of her vagina, but very briefly (never penetrated, strictly from the outside).
One week after the encounter, I started to feel some discomfort while peeing, the need of frequent peeing, and noticed a transparent discharge coming from the penis. I went to an STD clinic and they gave me antibiotics for both chlamydia and gonorrhea. The test results came back almost one week later and it was clear (for HIV, chlamydia and gonorrhea). The discharge and discomfort disappeared.
Now (6 weeks after the encounter) I started to notice fresh blood on the toilet paper and having diarrhea (sometimes, only clear mucus in my stool). I've started noticing this for the past 4 days. I am also noticing small white bumps on my upper lip and around the corners of my mouth. They are NOT painful and they don't cause any discomfort (looks like a Fordyce spots).
I am also experiencing loss of weight and appetite (I lost 6% of my weight, since the encounter, in 6 weeks). The anxiety of this encounter might be the reason.
I am really worried, and I don't know how to get peace of mind. What are the chances that these are symptoms for STD (e.g., genital warts, Herpes, HIV)? given that the encounter that was strictly oral (fellatio and cunnilingus) and with no apparent sores of lesions on her?