I'm in a similarish position. DC has so many serious health probs as a result of chromosomal abnormalities
I deal with it in a mixture of ways. I try and revel in the greyness / uncertainty of it all. I remind myself that no one has a crystal ball.. I understand that my dc isn't going to get better but they still have a life worth living and that every moment is precious. I remind myself of other bereavements in my life - young, healthy people where death came completely out of the blue. We're all going to die. My dc will be younger than lots who do but again, I can't really know when that will be. Its not as though my dc has a clear cut disease and prognosis. My dc could live well into their teens or even beyond. They may not. Some days it feels so unlikely dc will see the year out. Usually that is a bad day - some hospital emergency or drama
I try and do something 'nice' everyday - quite hard cos we are in hospital a lot. Try and have days out as a family - getting on with regular, normal stuff. I take lots and lots of photos and video
I try and deal with the anxiety as a seperate thing (my friend pronouces anxiety as anxshitty - v apt!) I've /we've (dh and I as a couple) had various counselling. I talk to people - a couple of people I really trust. I write. Regarding fears and anxiety over something actually happening to my dc - that is more tricky cos those concerns are very real threat. I've had to fight to get more support (haven't we all?) We have a nurse come in overnight which has helped a lot
I'm v busy. I find the more I take on the less time I have for dwelling on stuff. I like having other things to focus on. I try and go out with friends / dh and keep some semblence / continuity with what my life was like before dc was born. Often seems v trite and like I am forcing myself / going through the motions at times.
Most of our family and friends have no idea how serious things are with my dc. My parents kind of do but seem very much in denial. Maybe people sort of understand but don't let on. I don't know. But I find this a help in that for the most part, it doesn't seem like being in some sort of limbo between life and death
I am a regularish poster on mn - not trying to be all mysterious but just prefer to not draw attention to all of this for reasons above. Am sorry you are struggling so much right now riven. I'll message you on fb. Am here if you want to talk