If you have rosary beads I'd recommend getting this sort of rosary ring. It's small and I never go out without it. That way it also won't bring an anxiety about drawing attention to what you're doing in addition to the normal anxiety.
Popular alternatives to
Venerare Crucifixion Rosary...
Double Accent 8MM Stainless Steel Black Anodized Card Ace Wedding Band (Size 8 to 13), 9