Nausea, vomitting, diarrhea and back pain

Hey everyone, just looking for some advice.

Since last night I was having some BH and intense lower back pain also some lightening crotch, they’ve since been super random throughout the day but also since yesterday I’ve been super nauseous and having diarrhea. I’m currently 33 weeks measuring 2 weeks ahead (34-35 weeks is much more accurate with my last menstrual cycle).

Just wondering any tips or tricks to ease the lower back pain, nausea and diarrhea? Feeling super defeated..