Hey Nikko.... I don't think this is the ideal situation but I would get the three pills, you take one tonight, your mom tomorrow and you on Tuesday. That would theorectically buy you until Thursday, neither one of you going more that 48 hours without it. My thoughts are that maybe the "withdrawal" can't be that bad in such a short period of time and in essence it will be approximately like half strength over 48 hours. I DO NOT RECOMMEND THIS ALL THE TIME, IT IS MY UNEDUCATED ADVICE ONLY SINCE YOU APPEAR TO BE IN A JAM. If I remember correctly Cymbalta is a capsule so cutting it in half wouldn't be such a good idea. And as you know, sharing medication isn't such a good idea even though your were trying to help your Mom out.

And be the squeaky wheel, you or your Mom pester the doctors office to call in the refill. Don't wait.

That's my advice, Good Luck.