Two weeks is a long time to wait to get a diagnostic mammo. Not that your condition will worsen in that time, just the 2 weeks spent worrying (which you can't help but do) can seem interminable. If you live in any kind of populated area, there are usually many, many places that could do your mammo. The place your doctor referred you to has a 2 week wait. But you don't have to go there. Call your insurance company and ask what other radiation centers are covered in your area and see if you can get a quicker appointment.
But regardless if you still have to wait the 2 full weeks, try to keep as many positive thoughts in your head as possible. There are many things that could cause your symptoms, and not all of them are "dreadful".... Even hearing that it is the dreaded "cancer", should not keep you from feeling positive. Getting a diagnosis is the start. Whatever you have, you then start your path toward healing. Hopefully yours will be a short path involving antibiotics or something relatively minor.