Did you end up drinking it? If so, did it keep you from getting sick?
If you were in wd for 5 days due to this, a different doctor/pharmacy might be a good idea. I find it pretty horrifying that a doc would give someone a script for oxy and then when they're insurance changes, not even give them a different medication to get them through the 5 days thus forcing their patient to go through agonizing withdrawal symptoms.
Poppy seed tea would keep withdrawal from oxy or any opiate at bay. It might even be quite strong depending on the potency of the seeds, the dose, and your tolerance. The seeds contain morphine, so it's actually fairly potent from what I have heard. If I were ever on opiates and it was either withdrawal or drinking the tea, I would most likely drink the tea as well.
However, the downside of poppy tea is that you don't know how much morphine is in the seeds. Therefore, you could drink too much and od on it. People have actually overdosed on it because of this. If you ever end up needing to drink PST, start with a small amount and work your way up rather than drinking a lot of it at once.