Okay... realize at least HALF of this is being hypervigilant following hospital stuff. As a hospital mom you get in the mode of CONSTANTLY monitoring your child. Their color, breathrate, o2 sats, heartrate, tone of voice, body motions, general mood, cognitive function, etc. When you're doing homecare, it's even more pronounced. In the hospital you have nursing staff and monitors to 'relax' with. Get some sleep knowing that you will get woken up if anything is off and that there are capable adults either constantly monitoring (nicu/picu), or doing vitals every 30-60 minutes. But once you go home... it's you, and only you... 24/7.
That doesn't go away for a LONG time.
In part... because it pays off/works. That hypervigilence gets you to the ER 'early' before things go so far south that they can't be pulled up from. It's that constant voice that says "Heparin = NO cuts!!!" or "PICC = sealing completely before any water source" (even clean water like a shower, much less microbe contaminated pool/lake/river/ocean water)... so it nips life threatening problems in the bud often on a MINUTE BY MINUTE basis. So it's lifesaving, and lifesaving... both in prevention and in fast acute care.
It REALLY doesn't go away for LONG time.
We're a year out from major stuff, but we're still in and out of the ER from time to time. (I remember my first "quiet" week VERY distinctly, because I got hysterical laughter from it and actually had to be sedated.) That week we'd only been to the ER 3 times, AND had gotten to go home each time, instead of it being an instant admittance to the hospital or PICU.
That hypervigilence? Still there.
I just fake it that it's not.
Why?
Well aside from looking/feeling like the 'crazy mom'... it would make my son afraid of living a normal life... which he's totally capable of at this point. So as long as he is in the same zipcode (or awake) I keep it together and smile and laugh and send him off to do normal stuff. Then I quietly breakdown after he's in someone else's care or dead asleep.
((For moms who haven't done the hospital-mom thing...it's similar to the first day of kindergarten, but EVERY durn day. Ya keep it together for your kids, then go break down in private.))
From everyone I've ever talked to who has done the hospital-mom thing... it typically takes a couple of YEARS to actually relax. But then, the moment you get a relapse, just minutes to go back into constant monitor mode.
((Rather ironically... constant-monitor-mode is actually kind of calming... when there's actual NEED for it. It's once they get 'better' and you're just chasing your tail that you start feeling like you're going off the deep end.))
Okay... so the other half... that's "just" normal parent worry. Everyone gets it, and most of us just fake that we don't or get to a point (through repeated exposure) where it honestly doesn't worry us anymore. Typically by age 5/6 normal parent worry has toned down to manageable proportions.
Add in hypervigilence + normal parental worry though? That can need counseling and or meds to kickstart normal. Situation based anxiety disorders are REALLY common following trauma (aka PTSD), especially longterm trauma like doing the hospital mom thing.
Obviously, parents who lose their kids need grief counseling... but parents whose kids survive often need MAD support. Especially if you don't have 1-2 shifts of home nursing care and are doing it all on your own.
This is all VERY normal, and VERY hard. You can totally do this... you just might need a little bit of help. I've already done PTSD counseling, but on top of already knowing how to cope with those things, I have a small bottle of emergency-calm. I've had it for a year, no refills, because this isn't my first rodeo. It's just take as needed, which for me will be 2 or 3 days every couple months. and then I'm fine. Or a half pill stomp. Other parents I know go onto antianxiety meds full time for a few months, and then taper off to "stomp when needed".
The brain is a funny thing... yours got used to running a full cycle... and now its trying to keep up that level of stress, even though you don't need it anymore. Hence the panic attacks. Counseling &/or meds will speed up the process a LOT.
But it still takes several years, and that's IF you're working on it.