Your search is correct. Oral sex is does not carry any risk of HIV transmission. However you may contract other curable STD's through this route.
Even if you tasted small amount of blood, and even if the blood was infected (status of your partner is unknown and very slim chance that he was an HIV+) your saliva contains several enzymes, capable of inactivating the virus almost instantly.
Symptoms do not mean much because they are often confusing and misleading. Many ARS like symptoms are similar to those, surface due to common infections, and secondly, many actually infected people remain totally asymptomatic.
If nothing else relieves you from the stress and anxiety, you have, get yourself tested for HIV antibody test any time now, collect your conclusive report, lay all your residual worries to rest permanently and move on with your life normally.