What’s coming into your senses all at once is not causing you to suffer. What’s causing you to suffer is your own actions. Focus on what you’re doing. Be alert to what you’re doing.
"I was just listening yesterday to a French Dhamma teacher saying that mindfulness is all about just being totally present to everything that’s coming into your senses all at once. Well, what’s coming into your senses all at once is not causing you to suffer. What’s causing you to suffer is your own actions, which is why the Buddha says to focus there — on what you’re doing. Be alert to what you’re doing." ~ Thanissaro Bhikkhu "The Mirror Inside"