Unintentional Doctor Shopping? for opiates

[SumoCat]

SWIM's having quite a flare up of what looks to be fibromyalgia. SWIM has a tentative diagnosis from a physician, but hasn't been to a specialist yet.

SWIM will not be able to see a doctor several days and, when she *is* able to, she will be in another city.

She's thinking of making a visit to her old doc to see if any relief is available.

However, she's concerned that if she sees this doc, gets prescribed an opiate, then comes home and finally is able to see a specialist, red flags might be raised in 'new doctor's' mind.

SWIM hasn't taken any opiates in several months and is not looking to doctor shop. She just needs to do something about pain asap.

How would others approach this? Should SWIM just grin and bear it until she gets to a doctor in her hometown? Or can she go for intermediate relief without fear of an interrogation from a new doc?
Thanks,
Sumo