I would use any available resource (and then think of a few more) before asking him for help.
More than anything it shows him, it will start you on a road to feeling more confident. That's really more important than anything he'll see.
You are so not alone. It is devastating what has happened, there's no getting around it. Doesn't mean you can't get through it though. You really do possess more strength than you know.
So, what will you do for yourself today? Your Mom is right about the things you can do right where you are. Even if you have to haul yourself out of bed and you do something while your bawling...do it anyway. It will help you feel better about you.
I like to take long walks/hikes and when all of this hit me, I would walk along (sometimes crying the whole way) until I felt a little better and could think. Whatever it takes so you can think clearly. And that takes time.
