Advice? :/ kinda gross sorry..but omg.

Okay so the last few times my boyfriend and I have had sex it's not been good. First, we had anal sex and I actually like had poop leaking from my obviously that sex ended pretty abruptly. Then it seriously happened again like a week later when I was sick. Then we tried to have sex last night and for some reason my vagina was just burning really bad and it he just finished and I just cried because I'm frustrated with how our sex life is going. It was super great until this stuff started I overreacting or is it understandable how I'm feeling?