I would keep looking, but I had the same thing happen to me last year. The doe I shot was hit a little high (arrow passed through) and I waited till the next day before begining tracking. I found her alive and feeding in a clearing. She was limping, but not mortally wounded. My arrow hit her above the lungs and below the spine. This has happend to me one other time on a nice buck which also lived. My buddy killed him during gun season and was able to examine the hit. The arrow went clean through and did not damage any vital organs. I have since moved my aimpoint from the double lung to the "sweet spot" (where targets show the lung, heart and liver overlap). It seems to make a triangle just above the deers armpit. I have talked to many people, processors, etc... The void above the lungs and below the spine does not contain any vital organs or arteries. From everything I have gathered deer hitin this area, can usually survive.

P.S. Nothing wrong about asking for advice. Wise men are those who ask for advice and help.