Majour pain in lower abdomen?

Ive had this feeling in my lower abdomin, tummy for about a day and it felt like i realy needed to burp, but now ive gone to bed i havent been able to get any sleep as the pain worsond and has spread to all arpund my lower abdomen and back. I dont want to wake the family up but its realy realy painfull to lie down but im realy tierd. Any sugestions on what it may be and what i can do?