Hello Ross95.  Grief hits everyone differently.  Sometimes it can take months or even years to surface.  A friend of mine was fine for twenty years after the death of his baby sister, then one day he had a complete mental collapse and for the very first time he cried for her loss.  Your grief for your Mother is now becoming evident in your mind and heart, and what I would say is be kind to yourself.  Cry if you need to, don't bottle it up.  You might find that grief counselling helps.  Your Doctor can refer you .  When my Mother died I was kind of on auto-pilot for a very long time......going to work and carrying on as normal, but a few years later it hit me like a ton of bricks that my mum was really gone.  You will never stop missing your mother, but in time you learn to live with the loss, good luck mate, xx