GI problems like crazzzyyyy with second baby

Pregnant with my second baby and my goodness this child is killing me!! Literally from one minute to the next is either extreme constipation or explosive diarrhea. The indigestion is unreal AND I’m only 23 weeks and I feel more discomfort and heaviness with this child now than I did at 37 weeks with my first (and he was an 8lb delivery at 37weeks, so he was BIG). Anyone else having second baby problems or just feel way more shitty this time around than the first? Is it normal to feel so incredibly uncomfortable this early? Any tips on what I can do to make this better? I’m miserable!!