Stress fracture or arthritis???!?

I am a reasonably fit, very active, 41 yr old woman. Have extremely active job(on feet 7-8 hrs), & use elliptical 3-4 X per week, 65 mins 7-7.5 miles. Suddenly, a week ago, the outer top & side of my left foot began hurting(don't recall getting an injury, but my job involves restraints & aggresive individuals, so it happens) quite badly. By the time I limped home from work, it was badly swollen. Never a problem before! I avoid MD visits other than emergency, so tried to tough it out for a week. But, it has been too swollen to even fit in my everyday shoes(other foot is fine), & it even wakes me from sleep. Finally called my MD. They call back, send me for xray at a radiology clinic & they say my MD will call me. 3 days later, never having even had anyone look at my foot, a secretary call me & says the MD didn't see a break, but it's arthritis. Now, this sounds odd to me. It's not even at a joint! It's midway up the long bone on the very side of my foot, and it's a precise quarter sized spot that hurts when pressed, or if I put any weight on that side, or even put my foot flat. It also hurts if I lift either of my 2 smallest toes. Does this sound like arthritis to anyone? I can barely work, nevermind workout, so any help is appreciated. PS- when I asked if he gave any instructions as to how to treat this "arthritis", she was silent for a minute, then said "noooooo". Is this professional? Does this MD just think I'm exagerating or something?