I have experienced a similar situation a few times... it’s tough to confront this pain and the feelings that align with it.. something that really helps me is running and swimming. Taking an hour to push your body physically creates good feelings even though I usually cry while doing it.. and it helps with sleep too.
I try and take my 3 kids with me too.. it’s a great time to be together and realise that you will survive this pain..loss hurts and it’s ok to take your time grieving despite what our society says!!!
And romantic love is only momentary ... reflect on the positive experiences .. your children!!! That love is forever