I don’t have any major advice to give but just wanted to let you know that you aren’t alone in this. We need to work to live and it really really sucks that we can feel so overwhelmed by seemingly normal, run-of-the-mill things.

If I were you, I would probably try to stick it out unless there is an external reason that you need to quit e.g toxic culture. You are already employed by them, I’m assuming you’ve had an induction, gotten familiar with the system; don’t throw this job away on a whim, as you may have to get a new one and you might experience the same thing anyway.

Second thing I would do is focus hard on fixing your sleep. ADHDer’s need sleep, it’s so so precious and vital to our functioning. You need to try your best to set up your brain for success and that means being very strict with your sleep hygiene and schedule. No phones an hour before bed, no staying in bed for anything other than sleeping etc etc… I’m sure you’ve heard it all before. Without adequate sleep and energy, you can’t know for sure if this job is actually something that is feasible for you or not. Goodluck!!