Take the offer!! Use the time to stabilize and get a routine of self care in place. I'm doing this right now after quitting my stressful job that put me into my worst depressive episode yet. I see it as an investment in myself that will have long term benefits for me, those around me and my future ability to work.

I also wish I would have seen the signs of me spiraling downward before it got so bad. I may have had the chance to avoid some of the pain. I think you might be getting that chance now. This morning I heard someone say about work: sometimes you have to take an intermission to find a mission. This is not failure, it's a step into a better direction.