I have to buzz in on this one. I know your in pain and completely sympathize.
I personally feel that if you have a good relationship with your doc and have never had an issue like this occur before. (And if I'm not mistaken I beleive you said you have not signed a pain contract).
Then I would approach the doc in such a fashion. Hey doc I'm not sure what your policy is and I'm kinda between a rock and hard spot. Unfortunately i went on vacation and I lost my medication... blah blah.. I'm not sure how it happened but it gone and I've done everything possible to try and retrieve them. Doctor i don;t want to Jeopordize my treatment with you. Thanks to your clinic you have given me my life back and turned back into a functioning human being. But my pills are lost and I know there are strict guidlines for filling medications, but doctor there has to be something we can do for situations such as these. I have been with you over "X' amount of years and this has never happened before and beleive me I will be sure to never let it happen again. Right now I;m just in unbearable pain. Is there anything you can do for me doctor....
So something along those lines.
The other side of the coin is while you will suffer for a few days to a week, this is a good oppotunity to bring your tolernace back down, also to see if it might be possible for you to get off the meds all together and access your pain level after not having taken them for a few weeks, you may decide that "Hey I feel great and I don't need these meds"
I'm not sure what your medical situation is and what I wrote above may not be possible based on what you medication conditions are, but if it is how great would that be. you lost your meds and that gave you the oppotunity to get off them all together.
If your pain is just to great, which i'm sure it will be hard to distinguish between withdrawl pain and real pain. But regardless if you just can't take the pain any longer than approach the doctor just as I have noted above.
Otherwise get yourself a buch of immodium and all the other tips people mentioned and tough it out.
I really wish you the best and sincerely sympathize with your current situation.
Please let us know how your doing and keep us posted as to any developments.
Good Luck again!!