Arthwen, maybe you have already done so but you could always try to ask to speak to your NP's supervisor regarding this run-around you've been getting. Let them know that it's very important that you that you go back on your meds and that you need help finding out the proper procedure to do so.
Also, do you have a family member or friend that could help you w/ this problem? If so, you should reach out to them for help.
As far as weight loss goes, this is the best place on the web for support, so I'm glad you found us! I'm also glad that you decided not to stop eating! Just try eating a little less and moving a little more than you have been. Your weight loss might not be as fast as you'd like, and you probably will have slip-ups, but the most important thing is that you make progress...whether it's 1 lb. a week or 3, or even that you didn't gain or lose anything, it's all progress.
Good luck with everything. Let us know how it all turns out.