According to the symptoms you described (gain weight, drink a lot of water, gasses) there seem to be three most probable causes. The first is increased obesity, which is most probable. The increase of physical activity might still not be enough to burn the calories you take daily (amount which is not provided). If the abdomen is the one that is most “bloated” (“I look like I am 7 months pregnant”), than it might be due to ascites, which is an accumulation of fluid in the abdominal cavity. The ascites itself has a numbers of causes.
Also, Cymbalta is a medicine that belongs to the group of selective serotonin and norepinephrine reuptake inhibitors (SSNRI), which have potential to cause syndrome of inappropriate antidiuretic hormone (SIADH). SIADH is characterized by fluid overload, without edema or hypertension. SIADH might be contributing to certain other persisting factors, taking under consideration that the most frequent dosage is 30 to 60 mg daily (although 90 mg daily is not considered as an overdose).
You might want a second opinion by a specialist of internal diseases.
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