Hello,
You could try contrast baths for your ankle - this is where you have a bowl of warm water and a bowl of cold water (a few ice cubes in the water helps to keep it cold) and alternate between the two, spending as long as is comfortable (5-10 mins or so) in each one.
If your ankle is swelling, try using ice on it (making sure that you wrap the ice in a towel to prevent ice-burn) and see if this helps.
The plantar fascia may be due to your altered gait as a result of the ankle injury, I have heard that anecdotally the iced water can be of some help.
If you continue to experience problems with either problems I would strongly suggest you either get back in contact with the consultant or get in to see a physiotherapist for further rehabilitation.
Hope this is of some help, please let us know how things go!
Ruth Cheesley BSc(Hons) MSc MCSP
Chartered Physiotherapist