I would like to tell you, though likely you cannot hear right now and must discover these for yourself. You will survive. Plain and simple. It may take months or years for you to move forward and start working on you and your life.
I too was sure I could not go on; that I could not do this without her. Guess what? I am.
Every other sentence in your post was her. The sooner you quit thinking every waking moment about her, the sooner your healing starts.
Here is the impossible part. You have no idea what she is doing or thinking or believing? The sooner you quit focusing on her, the better.
You can only control one person. You. Get up today, force yourself. Go walk around the block, run on the treadmill, walk the dog, anything. As long as you sit there and focus on her, you WILL be miserable.