When I had a dilemma like this I used Prescriptions Key West and got my Ultram the next day. It wasn't exactly cheap, about 120 for 90 pills and shipping, but it beats withdrawl.
I just wanted something fast. If you have good medical records and can get everything together fast, I would also consider using a standard US OP. Actually with many of them (I use meds123) you can send in your medical records when its time for a refill. If you order first thing in the morning, you will probably get some hydro by the next day. It probably won't cost much more than using Key west prescriptions.
Anyways I hope you get through this OK. I could really use my next refill right now, Im overdue, but can't afford anything extra. I don't have conventional credit cards, just a pre-paid, so I have to rely on cash for everything. If I had a CC, I would have those meds in hand right now. I guess it depends on how badly you need meds. With Crohns disease I would think that you would be able to get pain pills pretty easily. I guess that even with a well-known painful disease that can potentially be fatal, there is no guarantee the doctors will give you anything. God, when I worked at the hospital, I remember Crohns patients on Morphine drips and who take methadone on a daily basis. I would seriously think about talking to your doctor and honestly telling him that your pain is not being controlled and that you would like to see an expert-a pain management doctor. He should have no objections since there is no guarantee that a PM will give you narcotics either, but you have the right to ask for a second opinion and I think you should demand this!! Don't let them make you suffer.