Your symptoms are suggestive of narrowing, but not necessarily a blockage. If it is inflammatory in nature, the Remicade should help. If, however, the narrowing is the result of fibrosed scar tissue (the result of repeatedly healed ulcers and inflammation) then the Remicade will not do much. Let's hope it is a combination and that you will get some relief soon. In the meantime, you might find it helpful to moderate what you are eating. That might help ease your symptoms. The problem is you are going to have to play detective to figure out what works for you. When I get like this, I ease up on the amount of fibre (especially roughage like raw fruits and veggies and whole wheats and grains). To counteract the gas I eat a little bit of plain yoghurt (active cultures) in the morning and when possible, before meals. When I can tolerate it, I eat oatmeal in the morning. Sometimes I can't tolerate the oatmeal, especially if I am in a flare. But when I can tolerate it bulks up my stool and eases diarrhea. It might also work to relieve constipation.
I will also avoid grissly meats, like steak when things start backing up.
This might not be the prescription that works for you. You might find you need to increase your fibre n order to create bulk and soften the bm. The key is to try different things and be responsive to what your body is telling you.
Right now I am relying on liquid meal replacements to see me through a rough patch. That might be where you need to start just to see if you can ease your symptoms with a low residue diet.
Narcotics defnitely have a constipating effect, so if going to the bathroom is a problem, they may make it worse.
30+ years living with Crohn's.