I can certainly answer your questions.
1. It’s great that you went to your doctor and that they did all the testing for you. I find that it is common for the body to have different normal sensations from time to time. If you are not worried about something you probably do not even notice these but if you are anxious about having an STI you seem to notice these sensations. As most STI do not have symptoms it’s good to get a test done.
2. Your HIV test would give you an accurate result by 5 weeks but it can take up to 3 months for a final result. This means the majority of people would show a positive result by 5 weeks but there are a small percentage of people that could take longer. I would not be concerned about HIV as we do not see it passed from receiving oral sex.
3. There are a large number of different things that can make your throat red. I also find that stress can cause many different symptoms in the body.
4. We find that most syphilis tests would show a positive result by 6 weeks but that sometimes it can take as long as 3 months.
5. 2 weeks is too short of a time for the herpes blood test. It can take up to 3-4 months to show antibodies to herpes with the blood test.
6. Most chlamydia would show up in a test by 2 weeks, but sometimes it can take up to 6 weeks for it to show up in a test. If chlamydia was causing the symptoms in your penis, you would expect the chlamydia test to be positive when you went for your test.
7. Normal anus color can vary from person to person depending on skin tone.
It sounds like you are really stressed over what happened. It is common for people to feel different symptoms on their body when worried about STI. I have also found that sometimes people can actually cause symptoms by checking areas too much e.g. frequently examining penis.
I would recommend finding a way to reduce your stress levels, when you have been stressed in the past what has worked for you? Talking with a counselor can also help, in situations like this there can be lots of feelings of shame and guilt which add to the problem. I would also recommend seeing your doctor about any follow up tests and discussing your symptoms with them.
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