I imagine your worsened state is due to being off any mood stabilizers. I know the ect didn't work for you. Maybe going IP is a good idea. They can monitor you while you get your next round of ECT. I would do one more round and if nothing changes then stop. It might get better after more treatments, as I said before it took 13 for me to feel even the slightest bit better.

I understand the physicality of it. I've been feeling crushed under depression for a few days. Whenever I get depressed it's like a weight on my chest. I feel like I'm too exhausted to even breathe. I really hope things get better for you soon.