Your pain and sadness are palpable. Yes, the realist in you knows that he is not suffering, but right now, there is only the heartache. It's so hard, not only because you are missing him so, but he was not with you nearly long enough. And you are right, the pain does ease with time. Let yourself grieve at your own pace, know that it will hurt a lot, but when you are ready, memories of your precious Charlie will bring you comfort.