Intense pain. Debilitating weakness. What was driving…

He was just 30, but Colin McEwen’s life had become a living nightmare. Debilitating spells of excruciating abdominal pain had begun landing him in the hospital a few times a month. Then came the weakness, the insomnia, the seizures, and the anxiety. The pain, McEwen said, was “unholy, like someone is squeezing your intestines. It would…