Chance of getting HIV from a blow job? I'm freaking out.

So I'm 18. I've hooked up with another 18 year old 5 times. He's the only guy I've been with, but he's been with other guys. First two times we met, we had protected sex. Last three times we just did blowjobs and hand jobs and such. Fast forward to two days after our 5th hookup (we just did blowjobs), and I'm feeling terrible. Headache, sore throat, fever, my body hurts everywhere, and I feel like I have to throw up. He told me the chance is very low, and that strep throat/the stomach flu is going around. Should I be worried?