On friday night, I had really bad pains in my stomach. Then later on in the night about 4 o'clock in the morning I woke up and was being sick, ever since then I have had really bad pains in my stomach and everytime I have eat or drank any food I get really bad pains in my stomach, I tried having paracetamol but they didn't work and I can't keep nothing down, I've had it for 5 days now, what medicine would you recomend?