Yes really before you follow either course it is imperative you get a proper diagnosis. The colonoscopy and biopsy is the best. Fecal calprotecttin is a also a good indicator.
If you don't know for sure what the cause is best to go slow in treating the unknown.
A bottom up approach with [wiki2="Steroids"]steroids[/wiki2], [wiki2="Azathioprine"]AZA[/wiki2] is probably a better way to start.
Diet and lifestyle changes are indicated regardless of the diagnosis.
Surgery is a very drastic and irreversible treatment with or without having Crohns.
A stricture though is likely Crohns and may eventually need surgery but not before drug options have been fully tried
Did they rule out diverticular disease and or other possibilities?
Good Luck
