I'm with you. I actually find that specific aircraft types make me more prone to this than others and, as you've experienced, the CRJ-200 is the worst for me. Something about the window size and placement (too low on the fuselage), the air conditioning system...I don't know what it is. I can recall multiple experiences on CRJs that were combinations of motion sensitivity and anxiety.

I don't know that this technique would work for everyone, and it's not something suggested to me by a doctor (so I cannot vouch for the medical aspect), but I have found taking a Sudafed before my flight helps me dramatically. It prevents congestion and the stuffy feeling that for me seems to predicate an anxiety reaction. I also avoid bubbly drinks, like sodas, as all that gas expanding puts pressure on my stomach which also seems to trigger anxiety. It's been explained as a vagal nerve reaction.

Again, I don't know if that's something helpful to others, but I have certainly found it remarkably useful. A Sudafed before a flight keeps me in good mental and physical shape!