Hello,
Allowing the stress fracture to heal is important.
What was the cause of the stress fracture: spasms,overuse, trauma?
If the bony islands in the ankle are causing
pain and dysfunction then talk to your orthopedist about surgical removal.
The thickening of achilles is probably due to chronic tendonitis.
Essentially, address the stress fracture and bony islands first and consider the entire lower extremity function for long term injury prevention. Do you wear braces? Have you had physical therapy? Any corrective surgery planned?
Hope this helps. Keep us posted.