I offer my condolences on your loss. I don't know if there's really much I can offer here. In my experience, nothing takes its place when the shock & sad feelings lessen. It all just gradually fades into the background of everyday life & resurfaces periodically in one form or another from time-to-time when something comes up that jogs that particular memory. What's important, I think, is to not try to block or stuff down those memories & feelings, but rather to allow them to arise & fade at their own pace & to accept them with compassion. It's a practice often referred to as compassionate abiding. I wish you well...