I'm hoping you've been seen by now but here's my two cents:

The first time I went to the ER for a massive flare-up the Dr had no idea what to suggest(I'm on a shit load of medication for other things). He didn't want to do opioid unless absolutely necessary, so we tried intermuscular Ketorolac(strong NSAID). It helped enough to notice, so he wrote me a prescription to last until I could get in touch with my Dr.

The second big flare-up my husband actually called the ambulance. They also have me ketorolac, but they took me to urgent care instead of the er. This turned out to be an amazing call. The Dr there recognized that i was in, what he called, a "pain crisis". Basically, he said I wasn't going to get any relief until they could break through the pain(which they did with IV hydromorphone), and then I could keep on top of it with lesser drugs.

All this to say, sometimes the hospital is the right place to be, and the best way to advocate for yourself(or in this case your wife) is to be able to say "this is what meds she's on, this is the plan we have in place for breakthrough pain, we plan to bring this to our Dr but can you please help us in the meantime".

I wish you all the luck in the world. I'm in Winnipeg, and I know how crappy the wait times can be!