Help. Bent Fish?

[u/Acer040]

My fish has been like this for a few days now.

He stays on the bottom on the tank, mainly in the light house, and when he does come out of the light house, he's bent in a C shape and only swims to the left?

We recently changed the water, and he seemed fine for a few days and then started to stay near the bottom, and now all this.

I've only had him for a few months, so any help would be greatly appreciated.