Thanks for the response sir it was greatly appreciated, from my understanding of your post the odds should hopefully be in my favor that I escape this incident without getting sick and can continue my regular day-day activities without taking any extra precautions?
Welcome to the forum.
The STD risks associated with rimming (medical term analingus) have never been studied; all I can do is make reasonable judgments based on anatomy, and the frequency of various STDs carried in the anus and rectum.
As you already seem to know, the main infections risked by analingus are viral and bacterial intestinal infections, not traditional STDs. In other words, if you catch anything at all, it probably would cause a combination of nausea, vomiting, and diarrhea for a few days, nothing more. However, you certainly are not "virtually guaranteed" to acquire such an infection. Maybe a 5% chance as a guess; but that's only a guess.
Hepatitis A also is an enteric (intestinal) virus, so you are right to be concerned about hep A -- but not hep B or C. However, hep A is rare in outwardly healthy people and it is unlikely your partner was infected if she has not been sick with obvious hepatitis (jaundice, etc). So although it's a theoretical risk, it's really not a significant worry.
There probably are very low risks for gonorrhea, oral herpes due to HSV-2, and perhaps syphilis (except syphilis currently is rare in the US, except in gay/bi men). Chlamydia doesn't infect the mouth (or only very rarely), and oral HPV infections rarely cause any symptoms or problem. HIV has never been known to be transmitted by analingus and the risk undoubtedly is very low, even if your partner had HIV -- which is statistically unlikely.
If I were in your situation, if after 7-10 days I had no symptoms like oral sores, sore throat, or gastroenteritis, I would not feel a need for testing and would continue unprotected sex with my wife without fear of infecting her. But if you remain nervous about it, visit your local health department STD clinic and follow their advice about screening tests.
Regards--- HHH, MD