What causes choking when drinking soda or kool-aid?

When I drink a soda or some kool-aid, sometimes I get - I don't want to say choked because it's not really choking that's happening...I'd say it's like a stopping or closing of something in my throat; and it causes me to not be able to breathe for a moment when I try to swallow the drink. I guess that's pretty much choking, huh? Is it the sugar that makes the walls of my throat sticky and they stick together...? I know that sounds stupid, but I'm just wracking my brain. I can swallow like SUPER small sips at a time with no problem, but if I swallow a regular, just the way I swallow normally I get choked.