Let's get to understand your risk, did you see your condom break or slip to expose your urethra?
There is nothing called as 'possible exposure' in context to a condom failure, if it fails it is evident.
Oral sex is not a risk. Inspite what seems to be a non-exposure, I am going to tell you this, false negatives only occurs in one condition:
Being on ARV drugs and testing inside of the window period.
No other medicine or general drugs or any disease can make you immuno-compromised to not form detectable amount of antibodies to HIV infection.
I suggest you see a general practitioner for your ailments, it doesn't seem to be specific to HIV.
Hello, any info would be greatly appreciated
Thanks