Mouse Aiming Follow Wrong Direction - Help

Hi everyone. So, i ve got this script in C#:

using UnityEngine; using System.Collections;

public class MouseLook3 : MonoBehaviour {

public float sensitivityX = 15F;

public float minimumX = -60F; public float maximumX = 60F;

float rotationX = 0F;

Quaternion originalRotation;

void Update () { rotationX += Input.GetAxis("Mouse X") * sensitivityX;

 rotationX = ClampAngle (rotationX, minimumX, maximumX);

 Quaternion xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.left);

 transform.localRotation = originalRotation * xQuaternion;

}

void Start () {

 if (rigidbody)
     rigidbody.freezeRotation = true;
 originalRotation = transform.localRotation;

}

public static float ClampAngle (float angle, float min, float max)

{

 if (angle < -360F)
     angle += 360F;
 if (angle > 360F)
     angle -= 360F;
 return Mathf.Clamp (angle, min, max);

}

}

BUT it follows mouse while moving it up or down. how can i modify the script so it will follow it from right to left and opposite?

Can anyone help me with this coding?

Thanks in advance