What Is The Reason And Prevention Of Sharp Pain In Belly ?

Hello Sir/Ma am I have been experiencing a sharp pain near my belly button for couple of days, I did some research and found out that When it pains bloody or while substance should come out, If not i would have to get a surgery done This is really scaring me now. What could be the reason for this ? Some of my family member told me the following reasons. - I sit a lot, approx 12-15 Hours a day. - I am over weight (102) age: 22 - I smoke alot (avg 1 per day), from last 8 years - I intake lot of potatoes in a week - I Sleep every less, ( less then 8 hours) I hope if some one is able to help me. because i think i am the only person in the world to have this kind of problem, Because no else around me is having this problem. Hope some can help Thanks