I feel the same, 4 months ago I was probably the happiest I had ever been, I'd worked very hard and had my ups and downs along the road to get there, and now it's all gone I can't even be arsed trying to get it all back. Yet without it I will never be happy or make good of life, and it kills me.
My analogy is Imagine spending 3 years busting your arse off at uni and all the stress that goes with it and getting your degree at the end. Then before you get a chance to enjoy a bit of time off or put your degree to work, it is taken away, and someone says "well you can get it back". Well yes, I can do the degree again, but it will be hell, the stress will be worse because I'm having to do it all again from scratch, with the added benefit of having sever depression due to losing it in the first place. I'd rather just fuck it off. And thus is the story of my life, worked hard, put a lot on the line, lost it before I even got to enjoy a more relax life, and now I'd rather die than struggle to get it all again