hi there mine was all day, to the point i passed out, i would feel sick/throw up, i didnt eat as i didnt want to be sick, after i passed out my gp gave me some tablets, was told to take them on a morning after being sick but didnt work, so i rung my gp and asked if i could take them on a night, he said i could try. lucky enough, (touch wood) the m/s is easing off now. i did find that eating something small and often through the day did work.
fx, it eases off for you. x