I am sorry to hear that you are having some health issues. I realise this is a different kind of stress to BD bur it still can't be much fun. Maybe there is something in getting everything over and done with straight away so not to prolong the agony but as you say these last four years have helped you grow and live as a divorced family so you are now ready to take the next step.
Your H's behaviour makes me wonder if he wants everything to stay just as it is because it is working for him? There was an old poster, I can't remember her name who lived on a farm and her H would come by every day to work on the farm. He had an OW who he would see every now and again but was very cold and dinstant towards his W. She off course was very in love with him and desperately wanted to reconcile but he refused. Then after a couple of years she started to get attention from a friend and decided to go through with the D. Well you could have knocked her down with a feather! Her H was shocked and begged and pleaded with her not to go through with it because he thought they could continue to carry on the way they were because it was working for HIM! Needless to say she had enough and continued with the D. I think you are right, your H is starting to realise his much he will lose in this divorce...
(((mleigh)))
Me - 47 H - 45 D-16 M - 6 years Separated - May 16
Don't leave me behind can't you see me I'm shining... (Years & Years - 'Shine')