Fractures Vs. Ankle Sprains: Is My Foot Broken?
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To check if your ankle is sprained, recognize the difference between "reactionary pain" and "constant pain". Ankles sprains most often involve "reactionary pain". First of all, you should be seated and have your feet flat on the floor. This will relieve a lot of the pressure from the ankle of your foot. If after you sit the pain subsides, then most likely you have sprained your foot. Another ankle-sprain check is to softly stretch your injured ankle in all directions. If it hurts in any direction, you have a mild-to-severe ankle sprain.
Muscle and tendon structures surround the ligaments which connect the bones in your foot. A sudden misstep or fall can end up with you stretching or completely tearing some of those ligaments.
On the other hand,
"constant pain" is a good indicator you have fractured your foot. For starters, try and wiggle your toes. If you are unable to wiggle any of your toes, there is a chance you fractured a bone or entirely tore a ligament in your foot. Let's hope for neither.
To be certain your foot is fractured, let's do a massage test. Without moving your ankle, slowly and firmly massage your foot from top-to-bottom. Noticeable or excruciating pain can mean a broken talus (ankle-to-leg), fibula (ankle), tibia (ankle), calcaneus (heel), navicular (midfoot), cuboid (midfoot), or toe fracture. Next, sit yourself on the floor and face a firm wall with both feet straight in front of you. Now place the injured foot carefully on the wall which you are facing. Now softly push against the wall with your injured foot. If you are able to do this, no large bones are fractured or broken. If when you do this you have a sizeable amount of pain in areas other than your ankle, you could have broken small bones in your foot.
If there is pain in your foot and you have some difficulty walking, you have undoubtedly injured your foot. So the best thing for you to do is to stay off of it. If the pain you are having is "constant pain", excruciating, or preventing you from sleeping, go see a doctor immediately. If your pain is "reactionary", there is still a chance you have fractured your foot.
Shortly after injury, apply an ice pack to your foot. Notice there will be a recognizable amount of swelling, discoloration, pain, and possible inflammation of your tendons. Elevate the injured foot above your sleeping-head level and refrain from wrapping your foot when you are inactive. You will want to allow blood circulation to relieve pressure and also bring the swelling down.
A two week self-evaluation involving the R.I.C.E. method (rest, ice, compression, & elevation) is suggested if you choose not to see a doctor. During this period, wrap your foot before you walk somewhere close and use some kind of crutch if possible. Soak your foot in warm "Epson-water" baths two times a day by mixing warm water with Epson salt. Continue to ice the foot to bring down the swelling and remember to elevate it during rest.
After two weeks you feel the foot is not healing, swelling has not subsided, or your pain has increased, go see an orthopaedic doctor right away.
Sources:
WebMD, "Broken Foot." WebMD.com. URL: (
http://www.webmd.com/a-to-z-guides/broken-foot)
It took months to heal. Get to a podiatrist asap. It'll make a difference. Eventually what they did was have me keep it taped in order for the foot to be stabalized. 
I knew it was broken when I couldn't stand my sheets to touch my foot.
Had to get a walking cast for that one. And I severely sprained my ankle 3 years ago. Two very small fractures, nothing that needed to be set, but I ended up in a non-weightbearing cast for 6 weeks. So, you never can tell how they're going to treat it.
