down to the wire and running out of yarn

yep, that's right people. I am not going to make it with the yarn I have. seriously i have like 20 some rows to go and I don't think my yarn will last. and I am using Lorna's Laces Lion and Lamb what it originally calls for. my gauge was right. why is this happening to me? has anybody else had this problem? can somebody reassure me that I am going to make it? because I am too afraid to keep knitting to find out. I am hoping that this pattern called for every last inch of yarn or I am in some serious trouble. Now excuse me while I go off to cry some. . . .