Being the bill-payer who struggles with working, I feel your situation. I'm a damn mess some days for sure. It's not a fun position to be in. Do you have paid days available? (Sorry, no idea if that's a lag time thing or not, never having had them.) If so, I think it'd be fine to take one or two. I'd lean away from taking more than that, because it might make it harder going back -- don't want to let new job anxieties take root if that makes any sense. Just my opinion of course, based on my own adventures in anxiety. (Years ago, if I had a bunch of days off, I'd be afraid I'd forgotten how to pour coffee, lol.) Maybe that's not the case for you. Otherwise, something to consider.

Do you have any PRN meds that might help? Would half-days be an option for easing back into it?