One other thing to try if you find yourself in a "need meds away from home" situation: Ask a local pharmacist.
Find a local pharmacy -- preferably not a mega-corporate chain pharmacy like Walgreens or CVS -- and ask to speak to the pharmacist. Tell them your situation. They can often call your regular pharmacy and get your prescription transferred to themselves temporarily over the phone without even getting your doctor involved (if they have your meds in stock). This works better talking to the pharmacist in person than on the phone, especially if you need a prescription that invokes DEA scrutiny like pain meds.
I recommend avoiding the chain pharmacies not because their pharmacists are bad, but because they are often hamstrung by corporate policies that won't let them do things like this without a lot of red tape.
Pharmacists are medical professionals. Use them.
Pharmacists also don’t need your doctor to write a prescription. They can dispense on their own authority. Scheduled drugs probably have made this more complicated. But if you’re looking for something that can’t get you high when abused it’s worth a shot.
For something like insulin a pharmacist can get you an emergency supply without calling anyone, should they see fit. Might be rare to find such a person though these days.