You didn't posses a risk, using a condom for vaginal intercourse ensured your safety and oral sex is not a risk.
Also, if you had to check the condom with a water test, be informed that you suffer from anxiety, that sort of behavior is unusual for a normal person.
Please evaluate your options to see a counselor since you don't have a risk and yet you are worried about an irrational fear.
I personally don't take anyone's word for things like that. However, oral sex doesn't transmit HIV nor does condom protected sex. Adults only get HIV from unprotected vaginal or anal sex or sharing of IV drug needles. That it was a friend that you'd likely know if she has HIV makes it even more implausible. I would not be worried about this.
You just said she doesn't have any diseases so obviously you can't catch anything from her.