Wow, honestly I would know how I would react, I know when I found my ex looking at porn, and almost everyone does it and that is not the problem, it is the lies and deceit that seems to ruin the trust. I am sorry to host at your house with your child there is totally wrong, to me cheating is wrong anyway, no matter what. I would definitely get counselling separately and together if you want the marriage to work but I went to counselling and you both have to be honest. The problem with that is, one is normally honest and the other one that has the issues is not, so until both can be honest counselling does not really help, at least that is my opinion. I do understand how you feel and I would be concerned my my health issues also. I wish you all the luck in the world.