Left side sleeping and coping

Does anyone else suffer when lying on your left side. All reports state that this is the best position for healthy gut and organs however I fall asleep and wake up gagging and stomachache. My ibs is predominantly in my left bowel however recently the whole of my stomach is angry. I take omeprazole for gastritis. I just want to feel 100 percent and never do. It's so miserable as I don't even want to go on holiday anymore. How can I calm this down? Ive tried meditation, exercise, breathing, smaller meals, i don't eat before bed. Im not overweight and I eat sensibly. No matter how much i help myself nothing works .