Ladies! Advice? I'm desperate

I'm days away from my second trimester with baby #2 and I have never experienced nausea like this!!!!! If I breathe,move, sleep, eat, drink, literally ANYTHING and I'm nauseous to no end. OB prescribed something and it worked for about a week and that was it. My stomach feels full of gas all the time making me burp almost constantly and I feel so dang sick 24/7. Please ladies anything that has helped you????? I've done nothing but loose weight but belly is still growing I would just like to not feel so sick!!!