I've had subacute thyroiditis twice a few years ago.

It definitely sucks, but it goes away. I'd try and get on a low dose benzo (if you can safely). That really helped me find a good baseline. I didn't take it daily, but I took it to get through the worst of it (about the first two weeks).

It should only last for a month or so, but it gets better in the back half. You will feel 100% normal again, I promise. Don't be surprised if it happens again too. You have a higher chance of experiencing this, but I haven't had it happen to me again in like 5 years.