Abdominal Pain in the Front and Back Upper Left Area

[Coronado2000]

During the past 3 months I have suffered from acute abdominal pain located in my upper to mid left back, front and around my abdominal section.  The pain is constant but at times it gets worst especially after eating.  The pain is also accompanied with a constant headache that will not go away even with Tylenol.  I have severed nausea with no vomiting.  I am also for the most part constipated and have lots of gas.   I feel weak and I also feel like I am fainting at times.  I recently had both a colonoscopy and endoscopy and both were normal.   I also had a CT scan without contrast that also was negative. What do you think I might have?  What tests should I ask my MD to conduct in order to rule out anything?  I am a 47 year old male otherwise in good health. Thank you

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