Hmmm, you could be nausous from being constipated or from the anethesia-I once had anesthesia make me sick to my stomach for two weeks after the surgury. In my opinion it doesn't sound like an obstruction-search the forums and it seems with a blockage it's horrific vomitting and brutal pain that escalates...but I'm no doc, so listen to your body and if you're worried go to the ER.
I'd call your GI and see what he/she says, but to me personally it sounds like typical post-op anethesia related garbage that goes with surgury and Crohn's. That doesn't make it suck any less, I know. Maybe ask the pharmacist to recommend a laxative-I took Miralax, and it worked fine.
My GI me a pack of original blue Trident gum to chew after my hysterectomy-something about the artificial sweetner makes some people have diarrhea, and will alleviate the constipation. It worked like a charm for me, I also ate pureed pumpkin, it's a very gentle laxative, tastes great, add a little pumpkin pie spice, some whipped cream-YUM.
I really feel for you, I have this problem after every surgury, especially abdominal. The first two weeks after surgury always suck the most, so you're on your way to better days-sending you hugs and healing thoughts!:hug: