i know how you are feeling man, that feeling right before you start to get sick and your mind races about what you will do. i would try and get some meds to help the WD if you plan on detoxing. get some ibuprofin, loperamide ( TO BE TAKEN ORALLY lol) some benedryl to sleep. and if you can get other meds like clonidine or benzos, then grab those too.
or if you think your habbit is too big to do yourself. i would go to a catholic hospital, they cant turn anyone away (or so i have heard)
when you go in fill out the form in the ER and list the symptoms you are having. cold sweats, stomach pains weakness ect ect...make it seem like you dont know why you feel that shitty. they will ask you a bunch of questions about your prior health and so on, once they cant figure out whats wrong with you, tell them you think you might be WDing from pain medicne, that you are not sure. they should help you out. just make sure it seems like its your first time and have never been in WD before. if they think u are some junkie in there trying to scam meds they will toss you.
if that doesnt work and they try and discharge you with out treating you, tell them you are going to kill yourself, and they have to admit you, once they admit you, you can prolly get into a detox program. most hosptials have them.
obviously things can turn out anywhich way, but that is some advice that might help you.
i dont want ppl to think this is how to scam the dr's, but if you actually want and need treatment, if you seem like some junkie they will most likely turn you away. if you seem like you are in WD for the first time, they are more likely to help you, im thinking the rationale is since this is the patients first time, if they take care of the problem now, it wont be an issue in the future. it never works out like that, but you get the idea.