How to help my motion sickness?

I'm a college student who takes the bus to school ever day. It's paid for in my tuition & fees and parking costs $5/day so I pretty much have no choice but to take it. I've always had bad motion sickness on planes, boats and sometimes cars but lately it's become unbearable on this bus. I can't take dramamine even though that's what I usually do because it makes me super drowsy and obviously I don't want to be falling asleep in class. Does anyone know of any non-drowsy medicine or home remedies that can help me?