Many people who get infected experience a short illness 2 to 6 weeks after infection that looks and feels just like the flu. Also like the flu, it lasts about a week or two and then goes away. After that, there are no signs or symptoms of HIV for many years, until the virus has weakened the immune system enough to allow for other infections to set in. This takes, on average, 10 years.
If you had been infected one year ago, you would not be having any symptoms now so your stomach issues have nothing to do with HIV.
A latex condom protects against HIV because HIV needs direct access to the blood stream either through an open sore or wound or through a mucous membrane. Unless you have some open sores or wounds on your penis, the only real point of entry is the urethra which was protected by the unbroken condom.
HIV is a very hard STD to catch. Some other STDs, such as herpes, are very easy to catch because they only require skin-to-skin contact.
You received oral sex and had vaginal intercourse with a condom that did not break. HIV cannot pass through an intact latex barrier. It doesn't matter that the condom slipped slightly during intercourse: that is normal given the mechanics of sex. As long as your urethra was always covered by the condom, you were not at any risk for HIV.
Although an HIV test at 9 weeks is not considered fully conclusive, it is still an extremely good indication of status. However, since the sexual activity was protected by the condom there is no chance you got HIV from this.
HIV does not cause canker sores or loss of pubic hair.
Delays in antibody production can be caused simply by the individual's natural variation in bodily symptoms. Most people will have produced enough antibodies to test positive by 6 weeks. More than 99.9% will test positive by 13 weeks, and the rest can take up to 6 months due to either congenital immune illnesses or intensive medical treatments like organ transplants or chemotherapy.
Based on the risk you experienced, the STDs you might have been exposed to are herpes and syphilis. If you have not had a complete STD screening, it is a good idea. However, both of those diseases have symptoms that you should have noticed by now.
Again, to sum up, since the sexual contact was protected there was no risk. Your test confirmed that. You can stop worrying about this.
You were not at risk during this encounter, and there are no signs or symptoms that you would be experiencing even if you had been infected.
It's a good idea for everyone who is sexually active to get tested regularly, so perhaps an HIV test now - a year after the fact - will put your mind at least and clear away these unanswered questions?
I repeat: you were not at risk for HIV in this encounter as you have described it.