Write a few miserable country songs about it?
In a few days, the holidays will be over & there won't be such pressure to 'be with someone you love'... or such. So it will get easier. Until February, ha ha.. Then, you can find an 'Anti-Valentine's' concert or cabaret to go to? (or stand-up comedy show?) Or just an internet group of people who hate Valentine's, or such? (Okay, you're here on this forum already, probably plenty of support here around that time too...
) Then you're safe until 'International Women's Day' which is in March
Basically, try to fill your time with other stuff...
Fill your weekends and such days with interesting or odd things, find out what's happening in your town... Open up to new experiences, hang out with cousins or other relatives/friends who are still single or have recently gotten single too... go for trips, go hiking, visit friends in other cities... theatre, festivals, seminars... volunteer or get involved in the community... start a band or theatre group?
Also, go out with your male friends, or meet new single people - both men and women? Like BDDgirl said, it's better to not 'jump into something' right now until you get over her, it's okay to meet people and go partying/dancing or sign up for a new course of knitting/massage/cooking and such...
Time does heal all wounds. Sometimes 'no contact' can work best indeed, some people manage to do okay with staying friends too... You may also find interest in books about relationships, dating, communication, to see which mistakes not to do next time or such. Or what to look for in a potential partner.
jus, it's okay to tell a girl you want no contact from her (or change your phone number). You can tell her it's hurting you too bad and if she's a true friend, she'll understand. (She'll be insulted at first maybe, but she'll get over it.)