Have had a quick read through, and missed a bit, but what I am hearing is, he is playing tennis, going out, not being honest, getting angry with you!!!!, not supporting you, leaving you alone with an infant after having a fit!!! What a completely self-absorbed, self-serving, selfish simpleton.
Sounds like my ex, who ended up finally admitting to cheating with a minimum of 43 women, mostly paid for (by my money!), and I didn't have a clue. he only admitted 2 years after our split. We had an amicable seperation/divorce, until he found a new partner. He is an animal dressed in a white collar, and he doesn't deserve you. No matter how you handle this, you will be wrong, because they cannot stand you being right.
They turn nasty when you challenge them.... they don't want to be 'burdened' by normal life...it's all me, me, me. He can't even fucking step away from himself for 2 seconds to think of the implication of you having to recover from a fit and having to look after an infant...
Another site that really helped me understand a little more was Lovefraud.com
Best of luck to you. I know it takes a while for your world view to change, but it will, in time.
My life feels much better now that he is out of it (as much as is practical), I never realised how depressing his presence in my world was. How much life he sucked out of me, how responsible I felt for looking after him, till he was gone. I got physically sick because of him, it's not worth it. After 17 years of marriage, I mean nothing to him. It is a complete mind bend, but the more you stand up for yourself ( and don't say you made things worse, you made things real, not worse), the more you will find yourself.
It's going to be tough Alpha, but you are on the right route, keep going, one step at a time. His life has hardly been interrupted, he still plays tennis, he still goes out!!! He has demolished your world as you know it, and he is showing his true colours. Be brave, be as strong as you can, eat something, look after yourself, he is not worth you giving your health away for, and your children need you.
Take care
Jo