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If it should only hit with left,up,right,down use Raycasts.Your code will look lile that

public float[] CheckCollisions() {
    Raycast hit;
    float[] collisions = new float[4];
    if (Physics.Raycast(transform.position, transform.Vector3.Up, 100.0f, out hit))
        collsisions[0] = hit.transform.position - transform.position;
    else
        collsisions[0] = Float.NaN;
    //other directions
    return collissions;
}

This isn't the most beautiful way, make a Vector3 array with all directions you wanna check and then iterate through (and check current Vector for hit)

Sorry for mistakes, wrote this with cellphone.