Hang tough slightly broken girl. I'm currently going on 11 weeks since the diagnosis of my femoral shaft stress fracture. If your fracture is in the neck, then it could take even a little bit longer to heal. You are right, I've dealt with stress fractures in other parts, but the risks associated with the femur are really scary.
I spent 6 weeks on crutches full-time, and then 3 weeks after that using crutches part of the time, ie. I would use 1 crutch to walk across campus and any time I had to walk a long way, and around my office or around my home, I wouldn't use the crutches. I built up to walking more and more gradually. I wasn't feeling any pain while walking around at all.
It was at the 6-7 week point that I was able to start cross training, by biking, water running, and swimming. I think that the water running and swimming are your safest options, and if you decide that you want to bike (I hate the pool and I some days I just have no desire to go) be sure that you aren't standing up on the pedals, just stay seated and keep a high cadence. I started off with 20-30 minutes on the bike, and worked up to an hour over a few weeks, but I wasn't really going hard.
After biking, I would typically walk for 5 minutes, with one goal being to stretch out the quads after the biking session, and with a secondary goal of building up some leg strength and add some "impact." According to the doctor (I haven't worked out the physics) your femur takes the force of 2 times your body weight when walking, but close to 7 times your body weight while running.
I worked up to walking a mile, and then 1.5 miles, and 2 miles (1/2 an hour).
I also started to add the elliptical trainer after a few weeks. Start off by doing 5 minutes, building up to 15 minutes over a week or 2, and then up to 1/2 hour.
After 10 weeks my coach gave me the ok to re-introduce running. I've run for 4 days now. I am running 5-7 minutes per day on grass surfaces. My schedule over the next 3 weeks has me building up to 14 minutes of running, all on level soft surface, like the fields by my school. These runs aren't really to gain any fitness, just to introduce the body back to running gradually, allowing the muscles to strengthen. It's also a really refreshing thing to be able to go outside and run, after the last 11 weeks.
In addition, I am keeping up with the biking and pool workouts, but adding a few quality sessions, like 8 x 3 minute efforts with 90 seconds rests on the bike, or 12 x 2 minute efforts with 60 seconds rest on the bike... (These could also be done in the pool while water running, but I hate it...) These are basically to keep it interesting, and from feeling stale.
The most important thing to remember is that everybody's injury is different. What works for one person may not work the same way for another. You need to listen to your body. A little bit of soreness is OK, pain is not OK. Your legs will be a little sore when you first start back. If you ever feel pain in your injury area, that is a big clue to back off a little. You also need a little bit of stress on your bones to make them heal faster and stronger. But you need to know where the line is, and it is way better to be on the safer side of the line. If you feel like something is wrong, you need to know when to stop.
So far for me, I've been feeling great. I got my fracture diagnosed pretty early, and I've been playing it really safe through out my recovery. I think that it has been working for me so far. My only medical coverage is through school, and they don't even need for me to go back in to see them, only if I have any pain... An x-ray may show the fracture now that it's healed, but my understanding is that it isn't the best tool. An MRI would help, but I had one of those already, and it was expensive, and they won't have me do it again unless totally necessary.
Above everything else, keep a positive out look on life. Your bone will heal, and you will run again. In the mean time focus on the other parts of your life. Be smart and listen to your body. Remember to be patient. You will not be able to force yourself to heal, you need to give it the proper amount of time. You want this to heal, you don't want to re-injure it.
Best of luck to you, and I hope that you have a speedy recovery.