anything important to the game run should be a banner across the screen or something.How I could make it more visible? As for automatic use - that will be in the 0.24 IF you have doctor in your settlement. (Might actually remove that and use it automatically if you have bandage)
little status effect squares are fine for things like "bruised" that do not change the game state permanently
but making it need doctor to automatic is very illogical. your character is able to apply bandages when you click button so he knows how to bandage.
if you wanted injury system with healing time, then doctor would be for making injury degree LESS when treated and healing faster
but banner should be warning "you are dying, find bandages to not die" and play character should not be retard, he should put them on as soon as he finds them.