It is not clear from your post whether you gave or received oral sex. There is no known risk fro receipt of
oral sex, even ifyour partner had HIV. If you performed
oral sex on him, there may be a tiny risk for HIV, certainly less than 1 in 10,000 if he was infected.
2. No, I see no benefit from testing, given your ingestion of antibiotics.
3. STIs are not transmitted by kissing.
4. No, your partner is not at meaningful risk.
5.