Foot and akle injury

Last night i fell down our basement stairs that are not carpeted with the metal stripping, quick thought kept me from falling head over heal as i let my body just drop, however, i still tumbled, and landed on my foot bent behind me on the stairs.  Last  night had horroble pain throughout the night that left me in tears....

today got up, the whole top of my foot through my ankle up to my knee are very painful to the touch, and to walk on.  I can point my tow to an extent, but cannot bend it up towards me without shooting pain, the bottom inside arch is also very tender and painful by touch and when any pressure is put onto my foot.  I think i may have tweaked my knee as it is very tender and swollen.  There is no bruising on my foot anywhere. just the pain.

Unfortunately, I just started a new job and i do not have insurance coverage yet so i have not seen a doctor as of yet, needed some advice from anyone that can maybe help me figure out if it is serious enough to see a doctor or if it is just a sprained akle, possible broken or what.  anyone?  If it is serious enough i will just pay to see the doctor, but don't want to waste the money if it is not something they can help with.