You are grieving and it will last for awhile. All your feelings are normal and I wish you had a friend/counselor to talk your feelings out with in person. Speaking aloud of your feelings is so much more healthier than just writing them down here. I pray that the Lord send you a listener who will not judge or be impatient, but will just be there to listen to you. To bring you a comforting presence.
When you have such a young daughter, you need to compartmentalize your tears into private moments so that you can give her your peace. She also feels a loss, even that young.
I, too, lost my husband just a few years ago, and still feel lonely. It seems to be something that you just get used to feeling. I had to learn to draw on resources within myself instead of having a partner to help me.
One more thing. Every day ask the Lord to comfort you. His name is Comforter. During the day, watch for the ways in which He does this.