15 weeks and still sick?!!!???

Hi I’m 15 weeks today and have been on diclegis since week 9 because MS was so bad. Well I didn’t take it last night thinking I might not need it anymoreand what do you know... spent the entire day throwing up! Couldn’t keep water down until I took a pill this afternoon. Is this normal?? Anyone else still getting this sick at week 15? I fear I’m going to be on meds my whole pregnancy 😫