If this helps at all, try to think of it like this - you knew nothing of the billions of years before you were shot headlong into the light for the first time. Think hard on that and really try and imagine it, then remember it's to that state of nothingness, of non-experience and unknowing that you'll return. How peaceful right? You've been there before, we've all been there before.
It's hard, I know, because life and the ability to experience is all we've ever known. You'll be okay, though, I promise mate. Death isn't the opposite of life, it's part of it. And, for what it's worth, I'm with you in heart and mind, if not in person. Take comfort if possible in that.
Safe journey and best wishes as you return to the void.