Advice?

I just turned 26 weeks and my mood shifted out of nowhere. I’ve been snapping at people who look at me wrong and I’m filterless, if something makes me mad, I make it known. I’m usually never friendly and though I’m still friendly to people it’s not even close to how I used to be. I also just cry for nothing and I get so angry. I’m trying to contain myself but the littlest things literally make my heart race and it’s so hard to not say something. I’m not sure what to do to get my mood back to where it was?