Hello, any info would be greatly appreciated
Thanks
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.