Leave of absence

I am having a very hard time maintaining my professionalism and staying on task at work. I am sometimes distracted from my detox, but more times than not, I am off in another place. I have lost a lot of weight and am having trouble sleeping and my co-workers are aware that something is amiss.

But taking a break adds to my sense of being a failure-I'm also fearful of having too much time on my hands...

Has anyone taken a leave and if so, was it helpful?
Thanks-
M.