sadmadalan, your GP is right!
Try all the icing, rolling of the plantar fascia, and streches for your gastocs and soleus. They all help. massage can play a huge part in a speedier recovery. Find some stihff soled walking boots to ease the pain to start with, so the foot is resting whilst still being able to walk, and put a small heel lift under both feet to reduce tension to the achillies.
I find that simple insoles with medial rearfoot posting and lateral foefroot posting have been very helpful in some of my patients . . . but you need to find a Podiatrist to sort that for you