Are there ways to keep crohn's disease under control if you run out of medications?

Not really: The truth is that in a relapsing remitting type disease pattern like crohns disease, if your symptoms are controlled without medications, then you probably don't need to be on them at all. There are studies that show maintenance treatment will jdecrease time to relapse. There is also evidence of priobiotics for crohns but i wouldn't recommend them without a specific doctors recommendation.