In the medical office and especially in an urgent care facility or emergency room, we use the Ottawa ankle/foot rules to determine who needs an xray to diagnose a possible fracture. From your description, I can't tell if you your bone pain is in the area of concern. However, an inability to put your full body weight on the affected foot/ankle for at least 4 steps warrants an xray.
You're doing good by applying ice to your injury (remember to apply heat to an infection) but it won't get rid of pain from either a fracture or bruise. Instead, the idea of icing down the injured area is to prevent swelling. You can reduce swelling further by elevating the affected limb.
Since you need to drive a long distance, best to go see your family physician now for his/her opinion and to give yourself some reassurance.
I apologize but I still haven't figured out how to link appropriate (maybe it's my Chrome browser? I have to blame someone else!) but check out en.wikipedia.org/wiki/Ottawa_ankle_rules for more information. Good luck!
NOTICE: The information provided on this site is not a substitute for professional medical advice,
diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your
physician or other qualified health provider because of something you have read on Wellsphere.
If you have a medical emergency, call your doctor or 911 immediately.