Thanks all. Well, I had to roll my phone back (one of the only times I couldn’t stand the bugginess of the newest IOS) and so far my watch hasn’t bricked but I am bracing myself. If it happens, oh well. I will bring it to an apple store to restore it. Really a first world problem.
Update: The watch didn’t brick, but it no longer mirrors my phone and I don’t get texts, email, etc. The watch behaves, well, just like a watch but that is ok for a while.
Suddenly brick? No, some (most?) newer watchOS versions won’t communicate with older iOS. It’ll be fine again once you update to release 13. You can also send it in to Apple for a downgrade.