nauseous or stomach bug.. any meds?

brittany • 💗7.29.16..Baby #2..9.4.18
I am 19w2d and out of nowhere today I got really hot heat flashes and very nauseous. I was nauseous a lot in the first trimester but have been feeling pretty good since 13 weeks. today this is never like I felt before. stomach just hurts and my bones sort of hurt I am extremely gassy and a headache. I feel like it might be a stomach bug due to all of my symptoms. does anyone know if there is an OTC medicine or anything I can take to help me?! I have school and work all this weekend