Hi Lisa, welcome to PC!! It sounds like you've been through/are going through a lot and it's got to be really hard on you, I'm sorry
And, yes, hopefully we can help you a bit with the way you're feeling. There are some really understanding and supportive people on here.........and if it helps a little for now........you won't need to be alone.
I know things must be seem really painful, empty, hopeless......to you right now but it really isn't that long since the death of your mother and of your dog. Grieving can take time and be really painful........but that doesn't need to mean that you can't make it out the other side. And eventually hopefully the day will come when instead of pain when you think of your mother/dog, you'll be able to feel a warm feeling inside, you'll be able to smile at the memories, you'll be able to use their memories to bring you comfort.
And now while you're grieving.........try not to bottle things up, try to talk about the way you're feeling if/when you can, try to share some of the hurt/pain as well as some of the better times you had with them. And you know that they aren't really gone while you still carry them/their memories with you don't you...........they are still there with you, maybe try to allow that to give you just a little strength in what you're going through.
And if you need to check in (again?) with a doctor.........if things are really "bad".......no shame in that at all. So just keep it as an option if you need to.
But here.......well we're here for you so post as much as you want
Some great and understanding people on the Grief and Loss forum too if you want to check out there as well:
Grief and Loss - Forums at Psych Central
So again, welcome to PC, and I hope you find what you need/want on here.

Alison