An ill person, who is bedridden, and can’t turn around to face another direction, should close his eyes when Davening. (שו״ת חלק לוי סימן מ״ד).

As far as Davening in a non-Jewish cemetery were there are Tzlomim (crosses) all around it’s improper see משנה ברורה תקע״ט ס״ק י״ד