Burnout is understandable for anyone. I think that for those with bipolar disorder it can even be greater, since our intensity can be so extreme.

I hope you won't be hard on yourself for needing a break. You deserve one. However, it may be a good idea to fit in at least a very small desired task versus none at all. I say that based on my own experience. When I fall too deep into such a hole, it can be quite hard to get out again. It's safer for me to just take a nap on a figurative lower shelf... midway down.

Can you treat yourself to something nice and relaxing today? Truly, you deserve it.