The mechanism behind massive weight loss and difficulty urinating in males after bariatric surgery? (Photos)

I have a large amount of abdominal skin. I have lost 220# in the last year after duodenal switch surgery. Over the last 3 month I have had increasing difficulty urinating with weak stream, normal prostate exam, normal cysto, and no change with climax and proscar. Is pan ulcerous the answer and what is the mechanism that causes the difficulty urinating.

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