At times foot injuries and fractures
do not present well in the first X Rays. The primary goal of treatment is to somehow get rid of the swelling. Try applying some ice onto the lump every 4-6 hours for the next 2-3 days and ask your doctor for some anti inflammatory drugs. Once the swelling has reduced your doctor should do follow up X rays that might show a hairline/ stress fracture
At the moment PRICE is the best treatment.
P- Protect the injury
I- Ice application
C- Compression using a bandage
E- Elevate your leg for the swelling to reduce
Hoping for your quick recovery.