How do I stop this? I'm very scared/restless.

Lately, I’ve felt deathly afraid of just…being alone, forgotten, fading out of peoples lives. Last night was the worst of it, I had a dream about the ending of the world, my family all committing suicide, and being completely alone and helpless. I don’t know why exactly I feel like this, I have friends..I have family, but It’s gotten to the point where this feeling is so painful that I just would rather die than have to feel anymore of it. I really hate this anxious feeling like everything I’ve ever loved is going to disappear, so I want to before everything else does… I know that eventually everyone will grow tired of me and I’ll be alone again
I don’t know how to fix this. I want to, I just don’t know how. Please help me.