For the poison/disease bit I'd recommend SmartDebuff which generally comes packaged with Smartbuff its main function is to alert you and allow you to clear debuffs with a right or left click on a mini grid representing party and raid members. Where this would help you is when you hear its alert sound and an icon turns bright blue (in range) throw poison totem, red disease totem. It turns those same icons a darker color if they are out of range, telling you its not viable to throw a totem...