wake up to severe abdominal pain nausea, sweating, diarrhea

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Normal investigations including CT scans, HIDA Scan, upper GI endoscopy and colonoscopies - would indicate that you do not have major medical disorders.

The history of allergy related conditions and chronic gastritis could be due to elevated synthesis of histamine in your body.

Histamine is a biologically active neurotransmitter in the body which is most often associated with Type 1 IgE hypersensitivity (Allergy) reactions, bronchoconstriction, and increased gastric acid secretions (resulting in chronic gastritis). High histamine levels are also associated with chronic headaches, migraines, anxiety, depression, and other psychosomatic disorders. Excessive histamine results because of the inadequate methylation in liver detoxification.

The evaluation of this condition may be done with estimation of blood histamine and urine pyrole levels.

Treatment of such condition can be done with better antihistamines or with Selective Serotonin Reuptake Inhibitors (SSRIs). Supplementation with Vitamin C, Vitamin B6, Calcium and folic acid might also be helpful.

You may consult with your doctor or your allergist for additional information and help.

I hope this helps.