Luke.magpie,
You should have seen an MD (doctor) before deciding to take the cast off your leg. An x-ray was necessary so as to confirm normal bone healing process. Therefore, I advise you to visit an orthopaedist, let him examine you and he/she will guide you. Normally, he/she will ask you to have an x-ray to check the bone (you're talking about the fibula I assume). If the bone is healed properly, then physiotherapy sessions might be the next step to restore function.
Let us know of your next steps.
ilias