Crohns of jejunum and nausea main symptom?

Hello-
I have Crohns in my jejunum. Four years ago it was in the TI, but through medication and surgery it seems to have resolved there. I also have had duodenal inflammation and ulcerations, but it seems Omeprazole and Entyvio/Meth (10 mg) has reduced that to a minimal level of inflammation.

6 months ago my entire jejunum was effected by severe bowel thickening. My recent MRE showed some improvement (guessing due to Entyvio). It is now in the proximal half of my jejunum - left/mid abdomen. I'm not sure exactly how long the proximal half is, but hoping it's down to 4 ft vs. 8 ft of inflammation.

I have never been a Crohine with severe diarrhea. It's mostly been pain and nausea. I've also needed iron infusions. My b12 and d and everything else but zinc and protein are normal. Most recently it is slight pain and severe nausea. Is Crohns of the jejunum more likely to cause nausea? I feel like I'm sort of an odd duck with my symptoms. Like I should feel worse. I don't think my nausea is due to methotrexate since it's only been fairly recent that it's become severe. I've been on 10 mg since October. I also have zero appetite. Literally have to force myself to eat. I imagine pain would be worse if I ate bulky foods but I don't.

Also, does anyone know if Crohns of jejunum is harder to treat or has a worse prognosis? I'm more worried because the duodenal and TI areas were inches of inflammation (I had 8 inches removed of TI and the ileocecal valve and a little of the colon). But, now we are talking in "feet". After 12 years I can finally say I'm starting to freak out a bit.

Finally, not to be a sceptic, but I'm a bit leary of an automatic Crohns diagnosis by imaging only. My duodenum and ileum have been biopsied, but is it right to assume it's Crohns when the jejunum has not been biopsied? I know my history puts me at a disadvantage, but you never know...

Any help by those with experiences in their jejunum would be great.

Nausea has always been one of my primary symptoms. I think the jejunum is one of the few places I haven't had inflammation/ulceration, but I started with the TI, then stomach and esophagus, then rectum.

When I first got sick, I would wake up nauseous every single day and it wouldn't settle down until 11am-noon. This made my subway rides into work so much fun! (not really) I am surprised my first GI didn't give me Zofran but I always have some with me now.

Imaging alone is not usually enough for a diagnosis, although I received my initial diagnosis through a pill capsule endoscopy (which was then confirmed through a colonoscopy).