It sounds as though, for whatever reason, this green coloration is part of the visual changes that mark impaired consciousness for you. CO2 is highly narcotic, and if you're retaining at depth, adding that to the nitrogen could result in significant impairment. Most people, if they are verging upon losing consciousness, experience a sensation of "tunnel vision", but I suppose it's possible to have some other visual symptom.
Fuzz, it really does sound to me as though you guys need at least a period of doing what Peter and I did (and still do, to a degree). We would make arrangements to dive with friends, and when we got to the dive site, I'd dive with one of them and Peter would dive with another. We all got to enjoy diving, but we got to dive the way we preferred (which even now remains somewhat different). Over time, you may get stronger and more confident and more able to keep up without stress, but you may never want to dive as fast as your husband does. And if you're very lucky, over time, your husband may decide that, to dive with you, he is willing to slow down a bit. But matching spouses as buddies doesn't always work terribly well.