Was DH 'good' at the present buying thing? My dh is usually hopeless, but came up with something lovely for me this year (despite being a month late which I wasn't impressed about at the time). I digress......I think if he would have chosen something you'd love, then you should do the same for yourself. Is there anything you'd really like? Even if present buying wasn't his strong point, then you should treat yourself to something special anyway.
Like ww says, every 'first' occasion without him will be a hurdle.
Would your Mum be able take the girls shopping for a present for Mummy perhaps?