Suggest Medication For Motion Sickness

When I get excited I get sick... it started with me getting sick when I ate breakfast in the morning before I went to school... so I stopped eating breakfast. Now it's gotten to where if my youth group goes to like an amusement park I get up feeling bad and we go and in the ride there I throw up and feel sick the whole day. I have motion sickness but some mornings I just get sick... any answers as to why?