Since last night's patch, my game has been quite unstable. It started with this error:

A fatal DirectX error has occurred.(11000002)

I've never gotten it before and was able to play for about an hour today before getting it, but once I did, I am no longer able to play at all. The error occurs basically as soon as I login and the world loads.
I tried restarting my computer, closing out of all other programs, playing in a window instead of full screen, etc. but nothing helped. Eventually, I disabled "DirectX 11 Support" on the login settings and that helps a little, but about 1-2 hours of playing, the game still crashes each time. A couple of times this happened, I got just a blank error pop-up screen with a button, but nothing written on it. Clicking the button closed the program, just like with the DirectX error message.
I also had one time when the screen froze. The game was still active and I could click on things on screen, but the screen itself never changed. After staying like that for a few minutes, eventually I received the following error message:

An unexpected error has occurred. Exiting Final Fantasy XIV. 2021-08-16_11:17
igdumdim32.dll+17188
igdumdim32.dll+81197
igdumdim32.dll+1D817
igdumdim32.dll+3C7EC
igdumdim32.dll+3B72B
d3d9.dll+1583B4
d3d9.dll+159426
KERNEL32.DLL+1F989

With an "Ok" button that shut the program down when I clicked it.
I have screenshots if you need them.

I've been playing the game for a month now without any issues and all of this started happening today after the patch.
Any guidance is appreciated.
Thank you,
S