Please get yourself checked out, all this uncertainty is causing you stress and its not good for you, not mentally or physically. It can affect your bg too, and you might very well be worrying over nothing.
Even if you do have MS there is no 100% chance of your son developing it too, and look at it this way IF you have MS then it took 56yrs to get hold of you, how old is your son? Let him live a cae happy life,not worrying already if he may get MS now or when he is 56? None of us know if or when or whatever, dont worry ahead, things may never happen and also might turn out completely different anyway. just make sure that you and yours are as healthy as possible, exercise, relax, eat healthy food, cut out transfats, etc, do what you can there - the rest is in the hands of God or fate or whatever.....
Re your home life, sorry you said that I am spot on, try and communicate with your wife, maybe see a counsellor together or alone, its not so good when you have to worry about divorce because you are ill or anything. Each to their own, I am no expert, but I think the basics of being with someone/family life should be a close, supportive, loving environment, you dont choose being ill do you, what if your wife was ill? I hope not, but it cannot be right if you have to live in fear of divorce if something goes wrong with your health.
I am pleased you are in this forum, please dont bottle up your worries and fears, talk about things in here at least.
Karen