You just described me to a tee before Imuran,I do have a stricture,that was able to be ballooned,thanks to the Humira.
I had the same problem (doing both at the same time) sometimes with nausea and sometimes not. Actually, I had nausea a lot back then. I was diagnosed with Crohn's in June 1978, surgery due to severe narrowing (Ileocolectomy/resection) in December 2002, which progressed into Crohn's / Colitis a few years after surgery.
Earlier this year I had test results that showed "narrowing" and my GI was concerned about strictures. I was concerned that I was headed for another surgery. I was in pretty bad shape but in March 2008 I went on Low Dose Naltrexone (LDN) and I am so much better now. I don't know if it has helped the narrowing or not, but I will find out in July or August when I am scheduled for testing. All I can say is that I feel so much better now that my pain is gone (feels like the inflammation is gone too).
Best of luck to you! Try not to get stressed...we all know that stress "triggers" symptoms!