You aren't alone at all. It does get better. My situation my be a bit different, I was "fortunate" to get this bomb dropped on me at age 42.So starting over (minus half my assets) while hard, seemed doable. I learned and accepted rather quickly that my ex-wife never cared for me and actually hated (still does) me because I am everything she is not. This helped in my healing process tremendously, because she actually lost something/someone, I lost a headache, abusive gaslighting, manipulative albatross around my neck....pretty good trade for me.
Why tell you this? Everyone deals with their situation in their own way. I found peace in living in the present, always. I rarely worry about much of anything and this is after a 23 year relationship (19 years married) to someone who beat me down every chance she could get and I was on anti-anxiety meds for the entirety of our relationship. (and almost immediately off them once I went extremely low contact).
Where ever you get too, how long it takes, the journey is better in the present. Enjoy each moment as if you chose it. Anxiety will fade and a new you will emerge. I am shocked at how pleasant life can be, even with the challenges of a horrible co-parent and the state the takes 40% of my earnings and gives them to her so she can not spend it on the kids. None of that bothers me, it simply, is....
Be well, treat yourself kindly, and know you are now free. It does get better.