I lost my Nan 18 months ago - She was the only person I ever felt liked and understood me and was on my side as a kid.... It was tough to get over to say the least, and I probably never will fully..... I actually did cry at the funeral - I didn't try fighting it and I think that helped....
I don't know what advice to give other than to say just go with your feelings, and it will get better eventually..... Sorry, I don't do "Agony Aunt" very well - lack of empathy and all that 
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"Heeeeeeeeeeeeere's Johnny!"