Hand jobs are never a risk for STDs. Neither is her sitting on your chest, even if she was naked while doing so. Hands are not an efficient way of transmitting STD germs, and the skin on your chest/stomach is too thick for anything to penetrate.
If she had a syphilis sore on her tongue, you could be at risk for syphilis from the licking. Same goes for her putting your scrotum in her mouth. Syphilis is pretty uncommon, though, even in sex workers.
Overall, I wouldn't worry about it if I were you. If you notice any sores, get checked by your doctor immediately, but I'd be very surprised if you do.
Oh you could have been at risk for genital hsv1, but since you have hsv1 already, you can't get it again. :)