You had gotten banged up pretty bad by some dealers who were pissed at Jesse and Walter, so since they knew you were very sick and weak due to a heart condition and you have trouble walking and doing things on your own sometimes from an accident, they chose you as their target. Though you were born with the heart condition. Jesse and Walter walked through the door at about 3pm and found you coughing and wheezing on the ground, propped up against the wall.