Anxiety for my man

Is there any way to get over the anxiety he gets when we are making love and he ends up going flaccid because of the anxious pressure he's putting on himself? It wasn't always like this. We went through a period where I couldn't perform and now he's worried that the session may be his only chance for awhile. I'm not sure how to help him other than to tell him that whatever happens is fine by me. Suggestions? Anyone identify? Similar experience? Any help would be appreciated.