Does he have to notify me?

My stbx and I both released our attorneys from our case because we have no money. I will have to continue pro se. Divorce hearing is scheduled in two weeks but we have not settled alimony or ED. He calendared a 3 hour trial for his alimony claim and the hearing notice came from the court to me directly. We have not settlement on ED though. However, on the judges online calendar it shows that he is being represented by his old attorney who withdrew back in June. Does he have to notify me if he hires him to represent him again?

No, he does not.

So if I request updated affidavits, do I send my request to him directly?

You should send them to his attorney.