eulerAngles not accounting multiple instances

So i'm making a 3d spaceship game and i'm trying to get the pitch and yaw set up and they work just fine EXCEPT when i have more than one eularAngle in the code. It will only register the most recent code instead of all of them when i hit play. In the code below it will only register "Roll" but not "Horizontal" and if i were to switch them around it would register "Horizontal" but not "Roll". Please help

Code (CSharp):

1.     void FixedUpdate () {
2.  
3.         pitch += Input.GetAxis ("Horizontal");
4.         transform.eulerAngles = new Vector3(0,0,pitch + speed);
5.  
6.         roll += Input.GetAxis("Roll");
7.         transform.eulerAngles = new Vector3(roll,0,0);
8.