You can relax. It is hard for me to imagine safer sex than you had, regardless of the fact that your partner was a commercial sex worker and regardless of what infections she might have had. (Indeed, I think this is the first time I ever heard of someone using condoms, gloves, and barriers for oral sex all during the same exposure event!)
To your specific questions:
1,2) I cannot see any plausible STD risk here, even if your partner had every STD there is.