Two MAJOR things that can help right away, at least to notch it down from being debilitating:
1. Tell yourself and believe the way you feel now is temporary. It will change. Sometimes maybe for the worse, but also for the better. You will not be anxious forever.
2. Counterintuitively, the harder you fight against it, the worse it will be. You have to accept it. You must accept that RIGHT NOW - and maybe for some time , but not permanently - you feel like shit. Lean into it, accept it. Weirdly, the more you accept that you feel like shit, the sooner you won’t. Sounds insane - but it’s true.