Definitely get a second opinion. You may be able to bring your x-rays with you for review by the new doctor. Do Not bear weight on your foot at this time. From the type of fall you had it is very possible that you sustained a lisfranc fracture, which is treated with or without surgery. If no surgery, then a plaster of paris cast is applied and worn for 6 weeks. It was rather strange that the surgeon said he could see nothing wrong with your foot.
The bruising and swelling and pain are not unusual. Keep your foot and leg elevated above the level of your heart, in the meantime.