I had a similar situation with Remicade, it worked great for about two years then all of a sudden I found myself having constant battles of flares, eventually it resulted in a major flare. I have been on Humera now for about two years and I am starting to have similar issues, it feels like I am in a constant flare, not to mention the added issues I am having with constant pain in my spine and bones in general. I am almost 35 years old, I have had CD since 2004 and had 16 colonoscopys (I think my old doctor enjoyed doing them), I have gotten so used to them it is not even funny.
Hopefully you can find some solutions with test results allowing you to find a happy balance. Good luck