Oh, I'm so sorry.
There's just no getting around the devastation of losing someone close to us. Of course you're feeling scared and alone.
It's tough not knowing what happens after someone is gone, but I think you can be assured he's not in a bad place. Since what's beyond life is unknowable I hope you can come around to focus on taking care of yourself and missing your dad with all your heart, but without so much pain and worry.
The sadness of loss never goes away but it does get much, much easier.
{{{{ HUGS }}}}