I can't tell you how many times I have felt exactly the way you do right now. You can do this and you are not a lost cause... far from it.
Ok, Fridays are tough for you. What happened? Did you decide to go out? The biggest part for me was changing my routine and the people I associated with. It is not easy.
The first week is definitely hard. But I am finding out that each day gets better. I still struggle too, but am learning to ask for help. Next time that urge hits, please come on here and talk to someone. Reach out to anyone in your support group if you have one. I had to accept that I couldn't do this on my own.
What happened, happened. You can't change that. Start again today and move forward.
You can do this!