Aids Virus in Our World?

Can anyone get AIDS from oral sex or does the stomach acid kill the virus?

Yes you can get HIV from oral sex. While oral sex is considered to be low risk (compared with unprotected vaginal or anal sex) it is still a risk.

You are correct, stomach acid will render HIV non-infectious instantly, but HIV first has to travel through the mouth and down the esophagus before it hits the stomach acid.

In general, the mouth is a pretty inhospitable place for HIV to get inside your blood stream. But there are things that can increase your risk:
-bleeding gums (even small amounts of blood after brushing or flossing)
-cuts
-oral STI infections (lesions/ulcers)
-burns
-recent dental work

The person "performing" oral sex is considered to be low-risk and the person receiving it is at a theoretical/negligible risk --- meaning that there has been no reported case of a person getting HIV infection from someone "going down" on them, but it is theoretically possible.

It is recommended to wait 30mins-2 hours after brushing or flossing your teeth or eating any food that irritates the lining of the mouth.

It is theoretically possible that people who have damaged esophaguses (eg from gastric reflux) could also act as a entry way to the blood stream for HIV.

And to correct an earlier answer.
HIV can ONLY be transmitted by:
Blood
Semen (and pre-ejaculatory fluid)
Vaginal Fluids
Breast Milk

NOT URINE, SWEAT, TEARS, or SALIVA

Yes you can get aids from any bodily fluid such as vaginal secretions, sperm, or urine. After it gets into your body, there is no way to get it out and it will eventually kill you. It can only enter your body through an open cut/wound, mouth or the area down below.

the chance of this is 10% told to me by a doctor

Aids or HIV? HIV is a made up lie, do not believe anything that anybody else tells you, even if you text positive for HIV, DO NOT take the medication. It will kill you, HIV does not exist.