Going through fertility treatments is indeed far more traumatic to the health of the marriage than people realize. W and I went through treatments for both S's (she has a pinched fallopian tube on one side -- and her ovary on the other side doesn't/didn't fire so well.) The odds of us conceiving the first time was a bit of a long shot, let alone a second time. Not only did our finances get clobbered in the process, but so did our morale and our patience with each other.
Hindsight is 20-20, but I would strongly urge any couple going through such treatment to seek MC, even they believe everything else is okay.
