Could use some guidance with limit switches and a prox switch arduino mega

Yes Sir,
I do apologize for my incomprehensive programming skills. I am having trouble interrupting my motor with my limit switch. The program wants to complete the revolutions before stopping the motor. Programming micro controllers is a bit different than programming CNC machinery. So please, beat me up as much as it takes to get it through my thick skull.....
Thank You,
U_R

  pinMode (swP1, INPUT);  //limit switch left over travel motor #2  
  pinMode (swP2, INPUT);  //limit switch right over travel motor #4
  pinMode (mP, INPUT);     //mag sensor (proximity) switch between motors 2 & 4
  pinMode (enablePin, OUTPUT); 

  while (digitalRead (swP1)==LOW)  //while limit switch 1 is OFF 
{
    motor2.stall();                       //motor stop
    delay(3000);                         //3 sex
    motor2.go(FULL, -900, 10);    // motor 2 rotate CCW 4-1/2 rev's 
                                              //THE MOTOR WANTS TO TURN FULL 4-1/2 REV'S BEFORE THE SWITCH STOPS IT   
    if (digitalRead (swP1)==HIGH)   //if limit switch 1 is ON
{                                              
    }
    else {
      break;
    }
  }
}
void loop()
{
  if (digitalRead(swP1) == HIGH)       //if limit switch 1 is ON
      if (digitalRead(swP1) == LOW)    //if limit switch 1 is OFF 
{       
      digitalWrite(enablePin, HIGH);          // turn motor enable pin ON
      motor2.go(FULL, 2000, 10);            //THE MOTOR WANTS TO TURN FULL 10 REV'S BEFORE THE SWITCH STOPS IT
      delay (5000);                                //5 sec's   
    }  
  if (digitalRead(swP1) == HIGH)        // check if the input is HIGH 
{    
    motor2.go(FULL, -2000, 10);       // step motor 2 CCW 10 rev's
                                                   //THE MOTOR WANTS TO TURN FULL 10 REV'S BEFORE THE SWITCH STOPS IT  
    digitalWrite(enablePin, HIGH);      // turn motor enable pin ON
    motor2.stall();                          //stop motor
    delay(3000);                             //3 sex
  }
}