HI
Thanks for posting your query to Healthcaremagic. 
     I went through your query. Pain at the site mentioned by you could be caused due to multiple causes . Some common causes are : 
1. Kidney Stones :  If the stones are small it passes down from kidney to bladder causing pain anywhere between upper part of abdomen to genital region. 
2. 
Colitis :  It is infection of the gut , but usually it will be associated with loose motions but rarely it can cause 
constipation. 
3. Sub 
Acute Intestinal obstruction :  It is partial obstruction of your gut . 
4. 
Hernia :
5 
Pelvic Inflammatory disease ( if you are a female )
      So you need certain tests to get evaluated for these conditions. Also I need more information on your problem.
Your Sex ? Age ? 
Any Urinary problems ? 
Any discharge from Penis or Vagina? 
Any vomiting? 
Any fever?
    Get the following test done and revert back . 
Ultrasound Abdomen pelvis, Urine routine, Serum 
Amylase . 
    I advise you to drink plenty of water , fruit juice, avoid non veg food and eat more of vegetables and fruits. 
Hope this information was useful to you. 
Any clarifications feel free to ask .