Sharp stabbing pain both sides above pelvis below ribs. Pain in legs head pain weight loss?

Need evaluation. Without more details it's impossible to even speculate what might be going on. I strongly urge you to see your physician soon for complete evaluation. Sorry I can't be of more help. Good luck.
Abdominal Pain. Without more specifics like time, duration, associated symptoms with the abdominal pain it is difficult to tell what is going on. You should be seen by your primary care physician or ER/Urgent care soon.