X-rays only show Bone damage there are other structures such as ligaments and Tendons that may be damaged, but that said if you are only just out of the boot, swelling (and stiffness & temporary loss of range) is completely normal. If your foot is stuck in the same position for a whole month, the muscles are bound to shorten and weaken. I know you're in a lot of pain right now, but I'd give your foot a little more time to acclimatise to being without the boot before I had further investigations.