Hi Martin,
one of the keys to rehabing a foot injury is to strengthen the muscles back up agian. This doesn't happen by running. You haven't said where in the foot you damaged but any one leg balance work, on a wobble board or bosu ball. Going up onto your toes on one foot, doing lots of walking drills on toes high knees fast feet etc.
You cal also use a cliniband to hook around the foot and pull in and out forwards and back.
Once you can toe raise on one foot you need to progress to 2 foot jumps and hopping use a square and go forwards back and side to side plus diagonally.
Use pain as a guide with your running.If sore after you've done too much and so ice it and rest for 24hours. Add cross training if you feel you need an extra session, ie bike or step machine.
Good luck