As a western society, we handle grief very badly - there is no education about how it works, so people have to find out the hard way.
People like to think that grief is a train - it moves forward every day, and every day you are a little further away from the cause of your grief, so that in a few weeks, you can 'return to normal', and people don't have to be embarassed because they don't know what to say.
Grief is a sailboat on an ocean. Some days you sail along calmly, making progress, others you are rudderless in a Force Ten being driven past where you started from, and the sea is it's own master and changed without warning.
Accept that some days will be fine, others will be beyond bearing, and you will never 'get over it'. you will simply assimilate it into the fabric of your life where it will hurt, but gently, and there it will stay, for ever.
Take your time, go with it, don;t try and fight, endure your anger, fear, solitude, wondering, and pain. Talk if you can, keep silent if you can't, and pass this on to anyone else who is grieving - it's sound advice hard-won.