Will stress affect my results?

Have you found extreme stress levels do damage to your sperm quality and quantity?

Basically my SA is 1.1ml and a concentration of 400k per ml. We already have 2 failed embryo transfers and lately im under very high stress. Im afraid this will get my results even lower, so my question is how worried should i be? Also its family issues and since i cant lower my stress levels if this is a problem for my sperm is there any supplement i can take to battle the effects of stress?